CINXE.COM

<!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Issue Archive: 1906 | Scientific American</title> <link rel="canonical" href="https://www.scientificamerican.com/archive/issues/1906/"> <meta name="theme-color" content="#fff"/> <meta name="robots" content="max-image-preview:standard"/> <link rel="image_src" src="https://www.scientificamerican.com/static/sciam-mark.jpg"> <meta property="og:url" content="https://www.scientificamerican.com/archive/issues/1906/"/> <meta property="og:image" content="https://www.scientificamerican.com/static/sciam-mark.jpg"/> <meta name="twitter:image" content="https://www.scientificamerican.com/static/sciam-mark.jpg"/> <meta name="description" content="Browse Scientific American's archives going back to 1845"/> <meta property="og:title" content="Issue Archive: 1906"/> <meta property="og:description" content="Browse Scientific American's archives going back to 1845"/> <meta property="og:site_name" content="Scientific American"/> <meta property="og:locale" content="en_US"/> <meta name="twitter:site" content="@sciam"/> <meta name="twitter:domain" content="scientificamerican.com"/> <meta name="twitter:card" content="summary_large_image"/> <meta property="og:image:alt" content="Scientific American Logo"/> <meta name="twitter:image:alt" content="Scientific American Logo"/> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="icon shortcut" href="/static/favicon.ico" /> <link rel="alternate" type="application/rss+xml" title="RSS" href="https://www.scientificamerican.com/platform/syndication/rss/" /> <script data-layer="critical">;performance.mark('app-load-start');((d,ael,dcl,unl,cxl,log,onunl)=>{log('[readyState]',d.readyState);d[ael]('readystatechange',()=>log('[readyState]',d.readyState));d[ael](dcl,()=>log(dcl));d[ael](unl,onunl);window.onload=()=>{d.removeEventListener(unl,onunl);log('windowloaded')};})(document,'addEventListener','DOMContentLoaded','beforeunload','cancelled',(...msg)=>console.log('[dev]',...msg),()=>{window[cxl]=true;log(cxl)});((l,pii) => {if (pii.some(p => l.search.includes(p+"="))) {window.initSearch = l.search;const anon = new URLSearchParams(l.search);pii.forEach(p => anon.delete(p));history.replaceState({}, "", l.pathname + "?" + anon);} })(location, ["email", "magic_link", "token", "code", "state"]);</script> <script type="module" crossorigin src="/static/bundle.8cb7a993.js"></script> <link rel="modulepreload" crossorigin href="/static/chunks/preload-helper-4aa0ec7d.js"> <link rel="modulepreload" crossorigin href="/static/chunks/vendor-react-f9bf3b4a.js"> <link rel="modulepreload" crossorigin href="/static/chunks/sciam-bf662dfc.js"> <link rel="modulepreload" crossorigin href="/static/chunks/use-environment-8e046ff8.js"> <link rel="modulepreload" crossorigin href="/static/chunks/datalayer-d861d60c.js"> <link rel="modulepreload" crossorigin href="/static/chunks/use-piano-auth-sync-cec85dc3.js"> <link rel="modulepreload" crossorigin href="/static/chunks/useOverlay-fe78e6e1.js"> <link rel="stylesheet" href="/static/assets/bundle-49553f4a.css"> <link rel="stylesheet" href="/static/assets/DefaultLayout-2955ad5f.css"> <link rel="stylesheet" href="/static/assets/issues-39da08eb.css"> <link rel="modulepreload" href="/static/issues.0011fbd6.js" crossorigin fetchpriority="auto"> <link rel="preload" href="https://cdn.cookielaw.org/scripttemplates/otSDKStub.js" as="script" fetchpriority="auto"> <link rel="preload" href="https://www.googletagmanager.com/gtm.js?id=GTM-5FLM662" as="script" fetchpriority="auto"> <link rel="preload" href="https://www.scientificamerican.com/sciads/sciads.js" as="script" fetchpriority="auto"> <link rel="preload" href="https://cdn.tp.scientificamerican.com/api/tinypass.min.js" as="script" fetchpriority="low"> <link rel="preconnect" href="https://cdn.cxense.com/cx.cce.js" as="script"> </head> <body> <div id="app"><header class="headerContainer-8KxQ5" role="banner"><a href="#main" id="skipToMain" class="skiptocontent sr-only-focusable sr-only">Skip to main content</a><div class="header-1t1JE flex-aYeiI"><div class="left-ajw3c flex-aYeiI"><a href="/" aria-label="Link to homepage" class="logoLink-Wt3sq"><span class="sr-only">Scientific American</span><svg width="1em" height="1em" viewBox="0 0 120.79 128.39" fill="currentColor" role="img" aria-label="Scientific American"><path d="M7.98 58.19c2.3 0 5.24 3.18 14.53 3.18 13.66 0 21.75-8.57 21.75-17.86 0-7.86-3.73-12.94-11.43-17.23l-9.37-5.24c-4.05-2.3-7.46-5.32-7.46-9.92 0-4.92 3.73-7.7 9.69-7.7s11.35 4.21 13.02 13.26h1.98V.95h-1.83c-.16 1.43-.87 2.06-1.75 2.06-2.06 0-4.53-2.94-12.62-2.94C13.85.08 5.12 6.51 5.12 16.35c0 7.3 3.26 11.83 9.77 15.56l9.61 5.48c5.48 3.18 7.7 6.19 7.7 10.72 0 5.64-3.18 9.77-10.64 9.77-9.29 0-13.58-5.08-15.32-16.2H4.1V60.5h1.98c.16-1.67.95-2.3 1.91-2.3Zm65.97 3.26c11.11-.03 19.13-8.81 20.4-20.72l-2.22-.64c-2.54 8.26-7.22 12.46-13.97 12.46-12.23 0-16.04-14.93-16.04-27.87 0-15.56 6.11-21.28 14.13-21.28 5.72 0 11.83 5.72 14.45 16.59h2.06V.95h-1.91c-.16 1.27-.87 2.06-2.14 2.06-1.91 0-5.72-3.02-11.83-3.02-14.85 0-28.66 12.07-28.66 32.39 0 17.39 10.96 29.1 25.72 29.06Zm14.53 42.72L76.49 68.84H56.24v1.75c3.33.16 4.76.95 4.76 5.95v42c0 6.03-1.67 8.1-5.32 8.1-2.54 0-4.53-1.91-6.51-6.91L29.11 68.12h-2.7L6.35 119.89c-2.17 5.72-4.3 6.75-6.35 6.75v1.75h18.02v-1.75c-5.8-.24-8.65-2.7-5.8-10.48l2.05-5.4h17.88l3.45 8.97c2.3 5.72.64 6.91-3.73 6.91v1.75h39.62v-1.75c-4.13 0-6.27-1.19-6.27-8.02l.48-42.08 17.07 51.29h2.14l17.63-51.05v43.9c0 5.48-1.75 5.95-5.08 5.95v1.75h23.34v-1.75c-3.33 0-4.76-.48-4.76-5.95V76.54c0-5.56 1.43-5.95 4.76-5.95v-1.75h-19.85l-12.46 35.33Zm-72.88 3.1 7.56-19.85 7.63 19.85H15.6ZM120.79 2.7V.95h-23.1V2.7c3.33 0 4.84.32 4.84 5.95v44.14c0 5.48-1.51 5.95-4.84 5.95v1.75h23.1v-1.75c-3.33 0-4.76-.48-4.76-5.95V8.65c0-5.64 1.43-5.95 4.76-5.95Z"></path></svg></a></div><div class="center-oMgM8 flex-aYeiI"></div><div class="right-4LP3J flex-aYeiI"><button type="button" id="radix-:R5t:" aria-haspopup="menu" aria-expanded="false" data-state="closed" class="trigger-8ea-U" aria-label="User Menu"><div class="dropdownIconContainer-hDbEe"><svg width="1em" height="1em" viewBox="0 0 472 472" fill="currentColor" role="img" aria-label="User" class="dropdownIcon-XeKnP profileIconImg-pc8tD"><path d="M403 69a235 235 0 0 0-334 0 235 235 0 0 0 0 334 235 235 0 0 0 334 0 235 235 0 0 0 0-334ZM118 412a122 122 0 0 1 237 0 211 211 0 0 1-237 0Zm41-197a77 77 0 1 1 155 0 77 77 0 0 1-155 0Zm216 181c-14-43-48-77-91-92a101 101 0 1 0-96 0c-43 15-77 49-91 92a212 212 0 1 1 278 0Z"></path></svg><div class="dropdownIcon-XeKnP initials-z1adZ"></div></div></button></div></div></header><main class="main-gNG8x"><h1 class="issuesTitle-F-sWZ">Archive</h1><h2 class="yearSubTitle-yMM-q">1906</h2><div style="border-top:2px solid #444;padding-top:1rem;border-bottom:1px solid #ccc;top:calc(var(--nav-height,0px) - 2px);background:#fff;z-index:1;width:var(--standard-width);max-width:var(--standard-max-width);margin:1rem auto"><div style="margin:0 -1rem 0.1rem"><div class="decades" style="display:flex;justify-content:space-between;overflow-y:hidden;overflow-x:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;gap:0.2rem;padding:0 1rem 0.5rem 1rem;scroll-padding:1rem;font-size:0.85rem;flex-flow:row-reverse"><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1840s/">1840s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1850s/">1850s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1860s/">1860s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1870s/">1870s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1880s/">1880s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1890s/">1890s</a><a class="date-selector decade selected" style="cursor:pointer;border:none;color:#093969;border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:600;text-decoration:none" href="/archive/issues/1900s/">1900s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1910s/">1910s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1920s/">1920s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1930s/">1930s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1940s/">1940s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1950s/">1950s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1960s/">1960s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1970s/">1970s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1980s/">1980s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1990s/">1990s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2000s/">2000s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2010s/">2010s</a><a class="date-selector decade" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2020s/">2020s</a></div><div class="years" style="display:flex;overflow-y:hidden;overflow-x:scroll;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;gap:0.2rem;padding:0 1rem 0.5rem 1rem;scroll-padding:1rem;color:#777;font-size:0.85rem;flex-flow:row-reverse"><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1845/">1845</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1846/">1846</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1847/">1847</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1848/">1848</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1849/">1849</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1850/">1850</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1851/">1851</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1852/">1852</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1853/">1853</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1854/">1854</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1855/">1855</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1856/">1856</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1857/">1857</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1858/">1858</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1859/">1859</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1860/">1860</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1861/">1861</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1862/">1862</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1863/">1863</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1864/">1864</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1865/">1865</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1866/">1866</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1867/">1867</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1868/">1868</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1869/">1869</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1870/">1870</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1871/">1871</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1872/">1872</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1873/">1873</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1874/">1874</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1875/">1875</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1876/">1876</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1877/">1877</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1878/">1878</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1879/">1879</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1880/">1880</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1881/">1881</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1882/">1882</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1883/">1883</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1884/">1884</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1885/">1885</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1886/">1886</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1887/">1887</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1888/">1888</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1889/">1889</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1890/">1890</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1891/">1891</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1892/">1892</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1893/">1893</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1894/">1894</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1895/">1895</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1896/">1896</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1897/">1897</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1898/">1898</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1899/">1899</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1900/">1900</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1901/">1901</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1902/">1902</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1903/">1903</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1904/">1904</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1905/">1905</a><a class="date-selector exact selected" style="cursor:pointer;border:1px solid #09396922;color:#093969;background-color:#3576b322;border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:700;text-decoration:none" href="/archive/issues/1906/">1906</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1907/">1907</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1908/">1908</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1909/">1909</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1910/">1910</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1911/">1911</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1912/">1912</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1913/">1913</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1914/">1914</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1915/">1915</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1916/">1916</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1917/">1917</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1918/">1918</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1919/">1919</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1920/">1920</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1921/">1921</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1922/">1922</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1923/">1923</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1924/">1924</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1925/">1925</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1926/">1926</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1927/">1927</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1928/">1928</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1929/">1929</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1930/">1930</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1931/">1931</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1932/">1932</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1933/">1933</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1934/">1934</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1935/">1935</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1936/">1936</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1937/">1937</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1938/">1938</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1939/">1939</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1940/">1940</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1941/">1941</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1942/">1942</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1943/">1943</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1944/">1944</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1945/">1945</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1946/">1946</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1947/">1947</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1948/">1948</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1949/">1949</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1950/">1950</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1951/">1951</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1952/">1952</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1953/">1953</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1954/">1954</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1955/">1955</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1956/">1956</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1957/">1957</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1958/">1958</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1959/">1959</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1960/">1960</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1961/">1961</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1962/">1962</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1963/">1963</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1964/">1964</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1965/">1965</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1966/">1966</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1967/">1967</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1968/">1968</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1969/">1969</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1970/">1970</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1971/">1971</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1972/">1972</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1973/">1973</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1974/">1974</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1975/">1975</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1976/">1976</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1977/">1977</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1978/">1978</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1979/">1979</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1980/">1980</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1981/">1981</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1982/">1982</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1983/">1983</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1984/">1984</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1985/">1985</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1986/">1986</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1987/">1987</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1988/">1988</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1989/">1989</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1990/">1990</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1991/">1991</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1992/">1992</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1993/">1993</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1994/">1994</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1995/">1995</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1996/">1996</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1997/">1997</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1998/">1998</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1999/">1999</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2000/">2000</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2001/">2001</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2002/">2002</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2003/">2003</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2004/">2004</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2005/">2005</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2006/">2006</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2007/">2007</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2008/">2008</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2009/">2009</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2010/">2010</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2011/">2011</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2012/">2012</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2013/">2013</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2014/">2014</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2015/">2015</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2016/">2016</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2017/">2017</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2018/">2018</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2019/">2019</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2020/">2020</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2021/">2021</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2022/">2022</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2023/">2023</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2024/">2024</a></div></div></div><div class="issue__list-8JHD2"><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/12-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D98FBB14-4044-4611-AF94D9819687AE8D_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/D98FBB14-4044-4611-AF94D9819687AE8D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D98FBB14-4044-4611-AF94D9819687AE8D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-29">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/12-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C39E2B77-FD4E-48F0-ADC7F6FCCB5B3042_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1616supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C39E2B77-FD4E-48F0-ADC7F6FCCB5B3042_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C39E2B77-FD4E-48F0-ADC7F6FCCB5B3042_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-22">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/12-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/35F1D7E4-A6F1-489A-B37037DD97A85F0D_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/35F1D7E4-A6F1-489A-B37037DD97A85F0D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/35F1D7E4-A6F1-489A-B37037DD97A85F0D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-22">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/12-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3C48CE97-AE55-46E9-9123F5DE87F100F6_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1615supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/3C48CE97-AE55-46E9-9123F5DE87F100F6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3C48CE97-AE55-46E9-9123F5DE87F100F6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-15">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/12-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/56BEA278-6805-4F34-A77CF9601FEFB173_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/56BEA278-6805-4F34-A77CF9601FEFB173_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/56BEA278-6805-4F34-A77CF9601FEFB173_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-15">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/12-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BBFF3AE1-EBE8-4719-87D695941B3DD98A_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1614supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BBFF3AE1-EBE8-4719-87D695941B3DD98A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BBFF3AE1-EBE8-4719-87D695941B3DD98A_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-08">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/12-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/343BA3FC-B3A3-469E-B9ACE442659E51BD_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/343BA3FC-B3A3-469E-B9ACE442659E51BD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/343BA3FC-B3A3-469E-B9ACE442659E51BD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-08">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5ABBBCED-64E8-4043-A290CD691BA4992E_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1613supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/5ABBBCED-64E8-4043-A290CD691BA4992E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5ABBBCED-64E8-4043-A290CD691BA4992E_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-01">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1EF3E1A4-EFC1-4EA9-B04F448B56C74929_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/1EF3E1A4-EFC1-4EA9-B04F448B56C74929_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1EF3E1A4-EFC1-4EA9-B04F448B56C74929_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-12-01">December 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/11-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/ED0D4C1C-D9FF-4AE9-BE8BA4225101A28D_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1612supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/ED0D4C1C-D9FF-4AE9-BE8BA4225101A28D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/ED0D4C1C-D9FF-4AE9-BE8BA4225101A28D_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-24">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/11-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2A5CC091-95EB-4EED-95B85FDB7F2ECDDA_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/2A5CC091-95EB-4EED-95B85FDB7F2ECDDA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2A5CC091-95EB-4EED-95B85FDB7F2ECDDA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-24">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/11-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/93B39254-53CA-49C0-80B5D7977E92F949_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1611supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/93B39254-53CA-49C0-80B5D7977E92F949_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/93B39254-53CA-49C0-80B5D7977E92F949_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-17">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/11-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A23592F7-5445-4056-8FA5AE0781FA1B72_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/A23592F7-5445-4056-8FA5AE0781FA1B72_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A23592F7-5445-4056-8FA5AE0781FA1B72_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-17">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/11-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/ABA5F463-2FF1-425A-B18612E505933CF7_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1610supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/ABA5F463-2FF1-425A-B18612E505933CF7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/ABA5F463-2FF1-425A-B18612E505933CF7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-10">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/11-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E37329F3-3A5F-4744-8CD477D0ECBADE2F_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/E37329F3-3A5F-4744-8CD477D0ECBADE2F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E37329F3-3A5F-4744-8CD477D0ECBADE2F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-10">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/11-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8AE418BC-7AC0-449A-B65B8DFFE0FD9446_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1609supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8AE418BC-7AC0-449A-B65B8DFFE0FD9446_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8AE418BC-7AC0-449A-B65B8DFFE0FD9446_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-03">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/11-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/67386F5A-E0E9-49B8-9DDDD6759187606D_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/67386F5A-E0E9-49B8-9DDDD6759187606D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/67386F5A-E0E9-49B8-9DDDD6759187606D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-11-03">November 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/10-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C25EFACF-0666-4DF9-A10BFA99285EDBE0_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1608supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C25EFACF-0666-4DF9-A10BFA99285EDBE0_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C25EFACF-0666-4DF9-A10BFA99285EDBE0_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-27">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/10-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EEC6B97C-D541-476A-820F08C539622FC6_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/EEC6B97C-D541-476A-820F08C539622FC6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EEC6B97C-D541-476A-820F08C539622FC6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-27">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/10-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B0F26082-87B5-45F7-A8499F7264AE6D61_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1607supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B0F26082-87B5-45F7-A8499F7264AE6D61_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B0F26082-87B5-45F7-A8499F7264AE6D61_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-20">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/10-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/31790E19-B54B-4ECB-8FCF57E511C2FDAA_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/31790E19-B54B-4ECB-8FCF57E511C2FDAA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/31790E19-B54B-4ECB-8FCF57E511C2FDAA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-20">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/10-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F95B0303-4F4C-4558-BB24B558094EDBEB_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1606supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F95B0303-4F4C-4558-BB24B558094EDBEB_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F95B0303-4F4C-4558-BB24B558094EDBEB_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-13">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/10-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/83F29219-645D-4614-AF773BE0F1A79C5A_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/83F29219-645D-4614-AF773BE0F1A79C5A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/83F29219-645D-4614-AF773BE0F1A79C5A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-13">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/10-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/71826DD7-654B-4D0E-B4DB1C1FE243165F_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1605supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/71826DD7-654B-4D0E-B4DB1C1FE243165F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/71826DD7-654B-4D0E-B4DB1C1FE243165F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-06">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/10-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/43BF6224-9EFE-4393-9F45B5A4ACBA1E82_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/43BF6224-9EFE-4393-9F45B5A4ACBA1E82_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/43BF6224-9EFE-4393-9F45B5A4ACBA1E82_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-10-06">October 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/09-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFD8922C-9BE5-49C0-923DD18D3DB4B573_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFD8922C-9BE5-49C0-923DD18D3DB4B573_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFD8922C-9BE5-49C0-923DD18D3DB4B573_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-29">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/09-29/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4AE86B77-61DD-4731-A98B1ADC1070A8A1_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1604supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4AE86B77-61DD-4731-A98B1ADC1070A8A1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4AE86B77-61DD-4731-A98B1ADC1070A8A1_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-29">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/09-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6A7B37F4-BB3C-4B93-BE18B2F51A90D1E1_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1603supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6A7B37F4-BB3C-4B93-BE18B2F51A90D1E1_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6A7B37F4-BB3C-4B93-BE18B2F51A90D1E1_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-22">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/09-22/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F025A88B-9C99-4867-BF97C6B6EE39F972_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/F025A88B-9C99-4867-BF97C6B6EE39F972_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F025A88B-9C99-4867-BF97C6B6EE39F972_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-22">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/09-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7A32B543-388B-4A43-B652EC506A403CBC_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1602supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/7A32B543-388B-4A43-B652EC506A403CBC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7A32B543-388B-4A43-B652EC506A403CBC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-15">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/09-15/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E80AAB84-B5BE-479B-8B7E9B242C741683_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/E80AAB84-B5BE-479B-8B7E9B242C741683_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E80AAB84-B5BE-479B-8B7E9B242C741683_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-15">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/09-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/451FB535-F906-4ECC-860C3CF6ECED388B_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1601supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/451FB535-F906-4ECC-860C3CF6ECED388B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/451FB535-F906-4ECC-860C3CF6ECED388B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-08">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/09-08/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C6402A91-9382-40A2-BF389890FC8D1FB0_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/C6402A91-9382-40A2-BF389890FC8D1FB0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C6402A91-9382-40A2-BF389890FC8D1FB0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-08">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BDDECF85-3B7C-4892-8A5B6BB07514D773_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1600supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/BDDECF85-3B7C-4892-8A5B6BB07514D773_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BDDECF85-3B7C-4892-8A5B6BB07514D773_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-01">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3E58D7BC-BD09-472F-9CAA52F6FEFBE225_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/3E58D7BC-BD09-472F-9CAA52F6FEFBE225_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3E58D7BC-BD09-472F-9CAA52F6FEFBE225_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-09-01">September 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/08-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D9B2F48E-36CB-4B3D-8E3056388D7CAFCD_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1599supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/D9B2F48E-36CB-4B3D-8E3056388D7CAFCD_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D9B2F48E-36CB-4B3D-8E3056388D7CAFCD_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-25">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/08-25/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8DADC6A2-BE8E-4904-BBA38682AD33727A_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/8DADC6A2-BE8E-4904-BBA38682AD33727A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8DADC6A2-BE8E-4904-BBA38682AD33727A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-25">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/08-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F4738985-05FF-4C55-9CF9A80EACE80C7F_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1598supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/F4738985-05FF-4C55-9CF9A80EACE80C7F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F4738985-05FF-4C55-9CF9A80EACE80C7F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-18">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/08-18/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/42A94D77-16B8-45FE-825E430897662F3B_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/42A94D77-16B8-45FE-825E430897662F3B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/42A94D77-16B8-45FE-825E430897662F3B_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-18">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/08-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1D4E0575-54DC-4A13-959079128ADCFBF6_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/1D4E0575-54DC-4A13-959079128ADCFBF6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1D4E0575-54DC-4A13-959079128ADCFBF6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-11">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/08-11/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C9F1F3F4-706A-4DAA-8D6C8C4138570FC6_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1597supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C9F1F3F4-706A-4DAA-8D6C8C4138570FC6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C9F1F3F4-706A-4DAA-8D6C8C4138570FC6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-11">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/08-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/58F8B8F6-9F46-4BA0-98CB2AFFE8F23EB4_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1596supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/58F8B8F6-9F46-4BA0-98CB2AFFE8F23EB4_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/58F8B8F6-9F46-4BA0-98CB2AFFE8F23EB4_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-04">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/08-04/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/585EF542-D28A-49AD-96530E972A8EDBD8_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/585EF542-D28A-49AD-96530E972A8EDBD8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/585EF542-D28A-49AD-96530E972A8EDBD8_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-08-04">August 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/07-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DA83D7A2-EE80-4B8D-B6E13E14DC2D8BF7_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1595supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/DA83D7A2-EE80-4B8D-B6E13E14DC2D8BF7_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DA83D7A2-EE80-4B8D-B6E13E14DC2D8BF7_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-28">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/07-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4F564CD6-9E82-4ECC-9ECEA47D43E76FB6_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/4F564CD6-9E82-4ECC-9ECEA47D43E76FB6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4F564CD6-9E82-4ECC-9ECEA47D43E76FB6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-28">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/07-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/825203D3-95A4-46F5-95D793C09A752399_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1594supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/825203D3-95A4-46F5-95D793C09A752399_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/825203D3-95A4-46F5-95D793C09A752399_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-21">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/07-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D1A17CAA-5004-4430-9C55470E624CAC41_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/D1A17CAA-5004-4430-9C55470E624CAC41_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D1A17CAA-5004-4430-9C55470E624CAC41_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-21">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/07-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6171EA5A-4197-41B1-8D81251F9F6C25E5_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1593supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6171EA5A-4197-41B1-8D81251F9F6C25E5_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6171EA5A-4197-41B1-8D81251F9F6C25E5_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-14">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/07-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2B654104-21AB-4BB3-A1BD313470FD5FF0_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/2B654104-21AB-4BB3-A1BD313470FD5FF0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2B654104-21AB-4BB3-A1BD313470FD5FF0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-14">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/07-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A4AFAB62-6A71-4AE8-9174C69A7634FE96_source.gif?w=600" alt="SA Supplements Vol 62 Issue 1592supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A4AFAB62-6A71-4AE8-9174C69A7634FE96_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A4AFAB62-6A71-4AE8-9174C69A7634FE96_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-07">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/07-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/238B699F-B403-404D-BCF232AF1761927B_source.jpg?w=600" alt="Scientific American Magazine Vol 95 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/238B699F-B403-404D-BCF232AF1761927B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/238B699F-B403-404D-BCF232AF1761927B_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-07-07">July 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/06-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/75EF3411-1DD9-49AE-B88BB206CB3ACE90_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1591supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/75EF3411-1DD9-49AE-B88BB206CB3ACE90_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/75EF3411-1DD9-49AE-B88BB206CB3ACE90_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-30">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/06-30/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/27F68B9E-9AA9-443F-829D67D2A8A454FA_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 26" srcSet="https://static.scientificamerican.com/sciam/cache/file/27F68B9E-9AA9-443F-829D67D2A8A454FA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/27F68B9E-9AA9-443F-829D67D2A8A454FA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-30">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/06-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C142F297-10F2-4BB5-8B2BFB07B5606BEC_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1590supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/C142F297-10F2-4BB5-8B2BFB07B5606BEC_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C142F297-10F2-4BB5-8B2BFB07B5606BEC_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-23">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/06-23/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8A8150A1-9C3A-47E8-B912F0F3946ACB4C_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 25" srcSet="https://static.scientificamerican.com/sciam/cache/file/8A8150A1-9C3A-47E8-B912F0F3946ACB4C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8A8150A1-9C3A-47E8-B912F0F3946ACB4C_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-23">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/06-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1D890CB9-D0B1-497C-A98A000269DCCA6A_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1589supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/1D890CB9-D0B1-497C-A98A000269DCCA6A_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1D890CB9-D0B1-497C-A98A000269DCCA6A_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-16">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/06-16/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A06D34BB-1C36-4F5A-9A1D101157820727_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 24" srcSet="https://static.scientificamerican.com/sciam/cache/file/A06D34BB-1C36-4F5A-9A1D101157820727_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A06D34BB-1C36-4F5A-9A1D101157820727_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-16">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/06-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B83E2685-CB49-4E5F-B0384A5D4440BD55_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1588supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B83E2685-CB49-4E5F-B0384A5D4440BD55_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B83E2685-CB49-4E5F-B0384A5D4440BD55_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-09">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/06-09/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7BE98983-572F-4BA2-81B962C14117EF69_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 23" srcSet="https://static.scientificamerican.com/sciam/cache/file/7BE98983-572F-4BA2-81B962C14117EF69_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7BE98983-572F-4BA2-81B962C14117EF69_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-09">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/06-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8833546B-2BF9-4CB2-8004D02CB38CDA16_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1587supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/8833546B-2BF9-4CB2-8004D02CB38CDA16_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8833546B-2BF9-4CB2-8004D02CB38CDA16_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-02">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/06-02/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CA40AEDA-6552-4A0F-83D6D871C04E6ED0_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 22" srcSet="https://static.scientificamerican.com/sciam/cache/file/CA40AEDA-6552-4A0F-83D6D871C04E6ED0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CA40AEDA-6552-4A0F-83D6D871C04E6ED0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-06-02">June 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/05-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/248592F7-6E08-4477-A03D58724A34D475_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1586supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/248592F7-6E08-4477-A03D58724A34D475_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/248592F7-6E08-4477-A03D58724A34D475_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-26">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/05-26/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/72D58BD9-E80C-4309-A43519522911EDFB_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 21" srcSet="https://static.scientificamerican.com/sciam/cache/file/72D58BD9-E80C-4309-A43519522911EDFB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/72D58BD9-E80C-4309-A43519522911EDFB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-26">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/05-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/21A4DC18-DBE2-4B51-94F3B53047BF4ED2_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1585supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/21A4DC18-DBE2-4B51-94F3B53047BF4ED2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/21A4DC18-DBE2-4B51-94F3B53047BF4ED2_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-19">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/05-19/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1DBB2D74-4181-4075-AFB563CE3DF1E348_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 20" srcSet="https://static.scientificamerican.com/sciam/cache/file/1DBB2D74-4181-4075-AFB563CE3DF1E348_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1DBB2D74-4181-4075-AFB563CE3DF1E348_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-19">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/05-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D9FE8449-83BF-4709-A3E55D2F995012DA_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 19" srcSet="https://static.scientificamerican.com/sciam/cache/file/D9FE8449-83BF-4709-A3E55D2F995012DA_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D9FE8449-83BF-4709-A3E55D2F995012DA_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-12">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/05-12/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E185799F-E909-4B8F-B0065DA9E44FEE65_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1584supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/E185799F-E909-4B8F-B0065DA9E44FEE65_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E185799F-E909-4B8F-B0065DA9E44FEE65_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-12">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/05-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/93DE0C3A-CD93-463B-BA97E8ED2BD76EF6_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1583supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/93DE0C3A-CD93-463B-BA97E8ED2BD76EF6_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/93DE0C3A-CD93-463B-BA97E8ED2BD76EF6_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-05">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/05-05/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F5A4991E-312E-4091-A6B099BC86CA184F_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 18" srcSet="https://static.scientificamerican.com/sciam/cache/file/F5A4991E-312E-4091-A6B099BC86CA184F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F5A4991E-312E-4091-A6B099BC86CA184F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-05-05">May 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/04-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9E1497A1-34B9-44D2-A93FEC6B186F6D7E_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1582supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/9E1497A1-34B9-44D2-A93FEC6B186F6D7E_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9E1497A1-34B9-44D2-A93FEC6B186F6D7E_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-28">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/04-28/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/333E7604-1C9A-4123-B572F4141FBB84A9_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 17" srcSet="https://static.scientificamerican.com/sciam/cache/file/333E7604-1C9A-4123-B572F4141FBB84A9_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/333E7604-1C9A-4123-B572F4141FBB84A9_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-28">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/04-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EBC36E1A-FD85-4C5A-8AB4F8B64F95D165_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1581supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EBC36E1A-FD85-4C5A-8AB4F8B64F95D165_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EBC36E1A-FD85-4C5A-8AB4F8B64F95D165_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-21">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/04-21/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/28E78A0F-496B-494D-A54CC4FC538D908D_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 16" srcSet="https://static.scientificamerican.com/sciam/cache/file/28E78A0F-496B-494D-A54CC4FC538D908D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/28E78A0F-496B-494D-A54CC4FC538D908D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-21">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/04-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4162CAD3-02BA-4EA2-A84EBDE66471291D_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1580supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4162CAD3-02BA-4EA2-A84EBDE66471291D_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4162CAD3-02BA-4EA2-A84EBDE66471291D_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-14">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/04-14/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2B5E05C7-98CB-4A31-B975E2C18F070DCC_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 15" srcSet="https://static.scientificamerican.com/sciam/cache/file/2B5E05C7-98CB-4A31-B975E2C18F070DCC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2B5E05C7-98CB-4A31-B975E2C18F070DCC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-14">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/04-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/045FD8F1-6578-4964-99C0D63508BAA03B_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1579supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/045FD8F1-6578-4964-99C0D63508BAA03B_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/045FD8F1-6578-4964-99C0D63508BAA03B_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-07">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/04-07/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EC281B1B-CB02-4873-AE5DC2CF9B84B8A0_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 14" srcSet="https://static.scientificamerican.com/sciam/cache/file/EC281B1B-CB02-4873-AE5DC2CF9B84B8A0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EC281B1B-CB02-4873-AE5DC2CF9B84B8A0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-04-07">April 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/03-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2593E0B5-2D82-45FC-B100150C8C38B943_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1578supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/2593E0B5-2D82-45FC-B100150C8C38B943_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2593E0B5-2D82-45FC-B100150C8C38B943_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-31">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/03-31/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3EB2E735-F13B-4BC6-86CEF9A96050D397_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 13" srcSet="https://static.scientificamerican.com/sciam/cache/file/3EB2E735-F13B-4BC6-86CEF9A96050D397_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3EB2E735-F13B-4BC6-86CEF9A96050D397_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-31">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/03-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4863C9D2-B15D-42B7-A928131838A79092_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1577supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4863C9D2-B15D-42B7-A928131838A79092_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4863C9D2-B15D-42B7-A928131838A79092_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-24">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/03-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DEAF414E-B46C-47C9-AA17CB27ECA1CC8E_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 12" srcSet="https://static.scientificamerican.com/sciam/cache/file/DEAF414E-B46C-47C9-AA17CB27ECA1CC8E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DEAF414E-B46C-47C9-AA17CB27ECA1CC8E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-24">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/03-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FCAA23CD-1931-4DB6-BE8EC9F319FAEEAA_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1576supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/FCAA23CD-1931-4DB6-BE8EC9F319FAEEAA_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FCAA23CD-1931-4DB6-BE8EC9F319FAEEAA_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-17">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/03-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/85B6DDF3-D802-4A62-985AFD88CEF12CBC_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 11" srcSet="https://static.scientificamerican.com/sciam/cache/file/85B6DDF3-D802-4A62-985AFD88CEF12CBC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/85B6DDF3-D802-4A62-985AFD88CEF12CBC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-17">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/03-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/431E7B4E-1A80-4F54-B37CDE370B8A4F18_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1575supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/431E7B4E-1A80-4F54-B37CDE370B8A4F18_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/431E7B4E-1A80-4F54-B37CDE370B8A4F18_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-10">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/03-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FD2085BE-C791-4968-8F1A354D39414B09_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 10" srcSet="https://static.scientificamerican.com/sciam/cache/file/FD2085BE-C791-4968-8F1A354D39414B09_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FD2085BE-C791-4968-8F1A354D39414B09_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-10">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/03-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6264FFC6-2AFC-40B8-96997AEDB4BFB296_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1574supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6264FFC6-2AFC-40B8-96997AEDB4BFB296_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6264FFC6-2AFC-40B8-96997AEDB4BFB296_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-03">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/03-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/59FF6605-1B7B-4DBF-97548F79B401E3DB_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 9" srcSet="https://static.scientificamerican.com/sciam/cache/file/59FF6605-1B7B-4DBF-97548F79B401E3DB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/59FF6605-1B7B-4DBF-97548F79B401E3DB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-03-03">March 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/02-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B904FAF1-6715-435F-A10EC2C7974339AF_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1573supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B904FAF1-6715-435F-A10EC2C7974339AF_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B904FAF1-6715-435F-A10EC2C7974339AF_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-24">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/02-24/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/93FF7744-8AAB-4BF2-874EF9913BB6F282_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 8" srcSet="https://static.scientificamerican.com/sciam/cache/file/93FF7744-8AAB-4BF2-874EF9913BB6F282_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/93FF7744-8AAB-4BF2-874EF9913BB6F282_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-24">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/02-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6D2440BB-9AF8-4023-AFB51AC7BA0F24CE_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1572supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/6D2440BB-9AF8-4023-AFB51AC7BA0F24CE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6D2440BB-9AF8-4023-AFB51AC7BA0F24CE_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-17">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/02-17/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/01727319-5920-41F5-A445BCADB7DBE9D8_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 7" srcSet="https://static.scientificamerican.com/sciam/cache/file/01727319-5920-41F5-A445BCADB7DBE9D8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/01727319-5920-41F5-A445BCADB7DBE9D8_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-17">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/02-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/642D2D56-4E2C-41A6-8F8AD230AACE18AE_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1571supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/642D2D56-4E2C-41A6-8F8AD230AACE18AE_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/642D2D56-4E2C-41A6-8F8AD230AACE18AE_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-10">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/02-10/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8F9FC6AA-9CE6-42C2-97FFE8BF2A2F516F_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/8F9FC6AA-9CE6-42C2-97FFE8BF2A2F516F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8F9FC6AA-9CE6-42C2-97FFE8BF2A2F516F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-10">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/02-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A58EFC79-1B33-4DC6-BA8643AA18ACC610_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1570supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/A58EFC79-1B33-4DC6-BA8643AA18ACC610_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A58EFC79-1B33-4DC6-BA8643AA18ACC610_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-03">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/02-03/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/234C9355-2BFF-4E8A-931D9D868A250966_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/234C9355-2BFF-4E8A-931D9D868A250966_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/234C9355-2BFF-4E8A-931D9D868A250966_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-02-03">February 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/01-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4C954C90-E75B-4EB6-88D29E6B7A953C2C_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1569supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/4C954C90-E75B-4EB6-88D29E6B7A953C2C_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4C954C90-E75B-4EB6-88D29E6B7A953C2C_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-27">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/01-27/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/60B1CC00-F433-45A4-BB33A874B6884C68_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/60B1CC00-F433-45A4-BB33A874B6884C68_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/60B1CC00-F433-45A4-BB33A874B6884C68_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-27">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/01-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFA02D8E-4F53-4CAD-9ED555D004FF758F_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1568supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFA02D8E-4F53-4CAD-9ED555D004FF758F_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFA02D8E-4F53-4CAD-9ED555D004FF758F_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-20">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/01-20/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5F898883-4F32-4605-A5C227B42BF4AC32_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/5F898883-4F32-4605-A5C227B42BF4AC32_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5F898883-4F32-4605-A5C227B42BF4AC32_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-20">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/01-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B4C46BDE-37CB-4B4F-B90FDEEB51177201_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1567supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/B4C46BDE-37CB-4B4F-B90FDEEB51177201_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B4C46BDE-37CB-4B4F-B90FDEEB51177201_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-13">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/01-13/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A3D37F6E-39B7-4517-8FE2A7C7F8E837E7_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/A3D37F6E-39B7-4517-8FE2A7C7F8E837E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A3D37F6E-39B7-4517-8FE2A7C7F8E837E7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-13">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/supplements/1906/01-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/66219BB3-AF9C-422B-97EC709786C53954_source.gif?w=600" alt="SA Supplements Vol 61 Issue 1566supp" srcSet="https://static.scientificamerican.com/sciam/cache/file/66219BB3-AF9C-422B-97EC709786C53954_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/66219BB3-AF9C-422B-97EC709786C53954_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Supplements</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-06">January 1906</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1906/01-06/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/76B390A1-770B-4119-858639B0C2EC8EE2_source.jpg?w=600" alt="Scientific American Magazine Vol 94 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/76B390A1-770B-4119-858639B0C2EC8EE2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/76B390A1-770B-4119-858639B0C2EC8EE2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1906-01-06">January 1906</time></div></div></div></a></div></div></main><footer class="footer-VfsmT"><div class="footerContainer-pfbjC"><h2 class="footerMainText-wQ3og">Expand Your World with Science</h2></div><div class="footerFlexContainer-XKe5g footerContainer-pfbjC"><div class="footerLinks-m1THn"><p class="footerText-PzHcy">Learn and share the most exciting discoveries, innovations and ideas shaping our world today.</p><a class="footerLink-uRzI4" href="https://www.scientificamerican.com/getsciam/">Subscribe</a><a class="footerLink-uRzI4" href="https://www.scientificamerican.com/newsletter-signup/">Sign up for our newsletters</a><a class="footerLink-uRzI4" href="https://www.scientificamerican.com/">See the latest stories</a><a class="footerLink-uRzI4" href="https://www.scientificamerican.com/latest-issue/">Read the latest issue</a><a class="footerLink-uRzI4" href="https://www.scientificamerican.com/getsciam/gift/">Give a Gift Subscription</a><p class="footerSocialMedia-7KIIV">Follow Us:<a href="https://www.instagram.com/scientific_american/?hl=en" target="_blank" alt="Instagram link" title="Instagram"><svg class="footerSocialIcon-UQyIx" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M224.1 141c-63.6 0-114.9 51.3-114.9 114.9s51.3 114.9 114.9 114.9S339 319.5 339 255.9 287.7 141 224.1 141zm0 189.6c-41.1 0-74.7-33.5-74.7-74.7s33.5-74.7 74.7-74.7 74.7 33.5 74.7 74.7-33.6 74.7-74.7 74.7zm146.4-194.3c0 14.9-12 26.8-26.8 26.8-14.9 0-26.8-12-26.8-26.8s12-26.8 26.8-26.8 26.8 12 26.8 26.8zm76.1 27.2c-1.7-35.9-9.9-67.7-36.2-93.9-26.2-26.2-58-34.4-93.9-36.2-37-2.1-147.9-2.1-184.9 0-35.8 1.7-67.6 9.9-93.9 36.1s-34.4 58-36.2 93.9c-2.1 37-2.1 147.9 0 184.9 1.7 35.9 9.9 67.7 36.2 93.9s58 34.4 93.9 36.2c37 2.1 147.9 2.1 184.9 0 35.9-1.7 67.7-9.9 93.9-36.2 26.2-26.2 34.4-58 36.2-93.9 2.1-37 2.1-147.8 0-184.8zM398.8 388c-7.8 19.6-22.9 34.7-42.6 42.6-29.5 11.7-99.5 9-132.1 9s-102.7 2.6-132.1-9c-19.6-7.8-34.7-22.9-42.6-42.6-11.7-29.5-9-99.5-9-132.1s-2.6-102.7 9-132.1c7.8-19.6 22.9-34.7 42.6-42.6 29.5-11.7 99.5-9 132.1-9s102.7-2.6 132.1 9c19.6 7.8 34.7 22.9 42.6 42.6 11.7 29.5 9 99.5 9 132.1s2.7 102.7-9 132.1z"></path></svg></a><a href="https://www.youtube.com/user/SciAmerican" target="_blank" alt="YouTube link" title="YouTube"><svg class="footerSocialIcon-UQyIx" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 576 512"><path d="M549.655 124.083c-6.281-23.65-24.787-42.276-48.284-48.597C458.781 64 288 64 288 64S117.22 64 74.629 75.486c-23.497 6.322-42.003 24.947-48.284 48.597-11.412 42.867-11.412 132.305-11.412 132.305s0 89.438 11.412 132.305c6.281 23.65 24.787 41.5 48.284 47.821C117.22 448 288 448 288 448s170.78 0 213.371-11.486c23.497-6.321 42.003-24.171 48.284-47.821 11.412-42.867 11.412-132.305 11.412-132.305s0-89.438-11.412-132.305zm-317.51 213.508V175.185l142.739 81.205-142.739 81.201z"></path></svg></a><a href="https://www.threads.net/@scientific_american" target="_blank" alt="Threads link" title="Threads"><svg class="footerSocialIcon-UQyIx" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M331.5 235.7c2.2.9 4.2 1.9 6.3 2.8c29.2 14.1 50.6 35.2 61.8 61.4c15.7 36.5 17.2 95.8-30.3 143.2c-36.2 36.2-80.3 52.5-142.6 53h-.3c-70.2-.5-124.1-24.1-160.4-70.2c-32.3-41-48.9-98.1-49.5-169.6v-.5c.5-71.5 17.1-128.6 49.4-169.6c36.3-46.1 90.3-69.7 160.5-70.2h.3c70.3.5 124.9 24 162.3 69.9c18.4 22.7 32 50 40.6 81.7l-40.4 10.8c-7.1-25.8-17.8-47.8-32.2-65.4c-29.2-35.8-73-54.2-130.5-54.6c-57 .5-100.1 18.8-128.2 54.4C72.1 146.1 58.5 194.3 58 256c.5 61.7 14.1 109.9 40.3 143.3c28 35.6 71.2 53.9 128.2 54.4c51.4-.4 85.4-12.6 113.7-40.9c32.3-32.2 31.7-71.8 21.4-95.9c-6.1-14.2-17.1-26-31.9-34.9c-3.7 26.9-11.8 48.3-24.7 64.8c-17.1 21.8-41.4 33.6-72.7 35.3c-23.6 1.3-46.3-4.4-63.9-16c-20.8-13.8-33-34.8-34.3-59.3c-2.5-48.3 35.7-83 95.2-86.4c21.1-1.2 40.9-.3 59.2 2.8c-2.4-14.8-7.3-26.6-14.6-35.2c-10-11.7-25.6-17.7-46.2-17.8h-.7c-16.6 0-39 4.6-53.3 26.3l-34.4-23.6c19.2-29.1 50.3-45.1 87.8-45.1h.8c62.6.4 99.9 39.5 103.7 107.7l-.2.2zm-156 68.8c1.3 25.1 28.4 36.8 54.6 35.3c25.6-1.4 54.6-11.4 59.5-73.2c-13.2-2.9-27.8-4.4-43.4-4.4c-4.8 0-9.6.1-14.4.4c-42.9 2.4-57.2 23.2-56.2 41.8z"></path></svg></a><a href="https://www.facebook.com/ScientificAmerican" target="_blank" alt="Facebook link" title="Facebook"><svg class="footerSocialIcon-UQyIx" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M279.14 288l14.22-92.66h-88.91v-60.13c0-25.35 12.42-50.06 52.24-50.06h40.42V6.26S260.43 0 225.36 0c-73.22 0-121.08 44.38-121.08 124.72v70.62H22.89V288h81.39v224h100.17V288z"></path></svg></a><a href="/platform/syndication/rss/" target="_blank" alt="RSS feed" title="RSS feed"><svg class="footerSocialIcon-UQyIx" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M0 64C0 46.3 14.3 32 32 32c229.8 0 416 186.2 416 416c0 17.7-14.3 32-32 32s-32-14.3-32-32C384 253.6 226.4 96 32 96C14.3 96 0 81.7 0 64zM0 416a64 64 0 1 1 128 0A64 64 0 1 1 0 416zM32 160c159.1 0 288 128.9 288 288c0 17.7-14.3 32-32 32s-32-14.3-32-32c0-123.7-100.3-224-224-224c-17.7 0-32-14.3-32-32s14.3-32 32-32z"></path></svg></a></p></div><div class="footerImageContainer-omuef"><img class="footerImage-fMFhw" src="/static/assets/footerProductImg-f6732134.png" alt="Scientific American publications in print & digital formats" as="image" loading="lazy"/></div></div><div class="grid-c0--6 footerContainer-pfbjC"><div><ul><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/return-refund-policy/">Return & Refund Policy</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/about-scientific-american/">About</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/pressroom/">Press Room</a></li></ul></div><div><ul class="footer-links"><li><a class="footerSmallLink-tZvCu" href="/page/frequently-asked-questions/subscriptions-products/">FAQs</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/contact-us/customer-service/">Contact Us</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/international/">International Editions</a></li></ul></div><div><ul class="footer-links"><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/mediakit/">Advertise</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/accessibility-statement/">Accessibility Statement</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/terms-of-use/">Terms of Use</a></li></ul></div><div><ul class="footer-links"><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/privacy-policy/">Privacy Policy</a></li><li><a class="footerSmallLink-tZvCu" href="https://www.scientificamerican.com/page/california-consumer-privacy-statement/">California Consumer Privacy Statement</a></li><li><a class="footerSmallLink-tZvCu" href="#">Use of cookies/Do not sell my data</a></li></ul></div></div><div class="footerContainer-pfbjC"><p>Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www.springernature.com/us). Scientific American maintains a strict policy of editorial independence in reporting developments in science to our readers.</p><p>漏 2024 SCIENTIFIC AMERICAN, A DIVISION OF SPRINGER NATURE AMERICA, INC.<br/>ALL RIGHTS RESERVED.</p></div></footer></div> <script id="__DATA__">window.__DATA__=JSON.parse(`{"initialData":{"issues":[{"contentful_id":"3tBYwPbfYkWL5LqgpUzISD","mura_id":null,"path":"/issue/sa/1906/12-29/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 26","volume":95,"issue":"26","issue_date":"1906-12-29","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/6084F9C8-685C-4A2F-B4991EC28CB27477.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/D98FBB14-4044-4611-AF94D9819687AE8D_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2EeeXolE1JcxyWd3FG531i","mura_id":null,"path":"/issue/supplements/1906/12-22/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1616supp","volume":62,"issue":"1616supp","issue_date":"1906-12-22","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/1FBB61F6-D678-449B-B9B2C445131E74DB.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/C39E2B77-FD4E-48F0-ADC7F6FCCB5B3042_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4k80silzEMg0a4GRDsbks1","mura_id":null,"path":"/issue/sa/1906/12-22/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 25","volume":95,"issue":"25","issue_date":"1906-12-22","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/2174FD52-B2A9-4E75-95AE8A748E5BE58D.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/35F1D7E4-A6F1-489A-B37037DD97A85F0D_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4T1bS12RI9ET9tJh9HIG3Y","mura_id":null,"path":"/issue/supplements/1906/12-15/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1615supp","volume":62,"issue":"1615supp","issue_date":"1906-12-15","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/FFBB6F4C-6574-4DDF-91824F80C68A4272.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/3C48CE97-AE55-46E9-9123F5DE87F100F6_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5a1ZF8iiNDgcavCxRSvBgQ","mura_id":null,"path":"/issue/sa/1906/12-15/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 24","volume":95,"issue":"24","issue_date":"1906-12-15","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/775CBC61-2379-44FD-991AC637CD85274A.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/56BEA278-6805-4F34-A77CF9601FEFB173_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2c1fUZQpE5KImshUuir2Ae","mura_id":null,"path":"/issue/supplements/1906/12-08/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1614supp","volume":62,"issue":"1614supp","issue_date":"1906-12-08","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/0824D450-293A-42FE-9CCA577641AC3874.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/BBFF3AE1-EBE8-4719-87D695941B3DD98A_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4gynMGcmd0ahlBluklycKA","mura_id":null,"path":"/issue/sa/1906/12-08/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 23","volume":95,"issue":"23","issue_date":"1906-12-08","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/216144D1-EE45-454C-95A311EF32628D08.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/343BA3FC-B3A3-469E-B9ACE442659E51BD_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7rIZ9XoyOYcvPtkEEf4U8A","mura_id":null,"path":"/issue/supplements/1906/12-01/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1613supp","volume":62,"issue":"1613supp","issue_date":"1906-12-01","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/26C5FE01-DE72-4694-90F1E7F286D48855.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/5ABBBCED-64E8-4043-A290CD691BA4992E_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3HBlneHouv8AWORT0CqlJi","mura_id":null,"path":"/issue/sa/1906/12-01/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 22","volume":95,"issue":"22","issue_date":"1906-12-01","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/8546BB37-E642-4B27-87B691EF70B5905C.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/1EF3E1A4-EFC1-4EA9-B04F448B56C74929_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7iLcIZWfnRU4ZqFpRZDUPR","mura_id":null,"path":"/issue/supplements/1906/11-24/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1612supp","volume":62,"issue":"1612supp","issue_date":"1906-11-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/529AE09D-1B30-488D-9FD3F77CCFB22F3B.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/ED0D4C1C-D9FF-4AE9-BE8BA4225101A28D_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4wnPSro6U6Y5mRl70N5BiU","mura_id":null,"path":"/issue/sa/1906/11-24/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 21","volume":95,"issue":"21","issue_date":"1906-11-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/8CA38A7F-560C-4A78-9A31F7729BDB0EB3.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/2A5CC091-95EB-4EED-95B85FDB7F2ECDDA_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1GCjQiNiiThPeLQn4to9R7","mura_id":null,"path":"/issue/supplements/1906/11-17/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1611supp","volume":62,"issue":"1611supp","issue_date":"1906-11-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/B567B65F-5762-4CD3-B3EBCEBC5BD9A8C7.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/93B39254-53CA-49C0-80B5D7977E92F949_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"36RxZjH94K34t9cj6fmCDF","mura_id":null,"path":"/issue/sa/1906/11-17/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 20","volume":95,"issue":"20","issue_date":"1906-11-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/F176D308-501E-4367-BF450A094355FC61.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/A23592F7-5445-4056-8FA5AE0781FA1B72_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"afHZAZDx6M6rCAQuTlhw7","mura_id":null,"path":"/issue/supplements/1906/11-10/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1610supp","volume":62,"issue":"1610supp","issue_date":"1906-11-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/02B4E15D-862D-429A-891D7B7148529477.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/ABA5F463-2FF1-425A-B18612E505933CF7_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5dh4n6iJ3NekieAxcvp9GC","mura_id":null,"path":"/issue/sa/1906/11-10/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 19","volume":95,"issue":"19","issue_date":"1906-11-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/A15FB2CC-BC6E-4DC9-9C5192C383EFA78D.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/E37329F3-3A5F-4744-8CD477D0ECBADE2F_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1axT0xkmd3nM1xb6vlh4pQ","mura_id":null,"path":"/issue/supplements/1906/11-03/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1609supp","volume":62,"issue":"1609supp","issue_date":"1906-11-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D9798D13-432D-488F-988C4374D9CDEEB1.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/8AE418BC-7AC0-449A-B65B8DFFE0FD9446_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"59q0gQGnOjMHhp0sqNEORT","mura_id":null,"path":"/issue/sa/1906/11-03/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 18","volume":95,"issue":"18","issue_date":"1906-11-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/061B58B0-A319-42BC-B4371ED5C8D7EDFC.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/67386F5A-E0E9-49B8-9DDDD6759187606D_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6DInK3T1aOZfcr8auSOXYw","mura_id":null,"path":"/issue/supplements/1906/10-27/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1608supp","volume":62,"issue":"1608supp","issue_date":"1906-10-27","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/50501C36-C46F-4C26-9CA8EE904A3D8269.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/C25EFACF-0666-4DF9-A10BFA99285EDBE0_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6gKEJq9GdiXmd7JSg9WT8k","mura_id":null,"path":"/issue/sa/1906/10-27/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 17","volume":95,"issue":"17","issue_date":"1906-10-27","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/107B22DC-D6BF-42BD-A3602FD61220AA3C.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/EEC6B97C-D541-476A-820F08C539622FC6_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6Qa5YSmdDXK5hXutXg1xLc","mura_id":null,"path":"/issue/supplements/1906/10-20/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1607supp","volume":62,"issue":"1607supp","issue_date":"1906-10-20","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/76401D2C-6D54-4F8D-9769051E73D46729.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/B0F26082-87B5-45F7-A8499F7264AE6D61_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6BmofH4jprJeUR5bTxWfY7","mura_id":null,"path":"/issue/sa/1906/10-20/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 16","volume":95,"issue":"16","issue_date":"1906-10-20","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E8E43FE3-FCCD-4183-BAB0E2DBE63E6B00.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/31790E19-B54B-4ECB-8FCF57E511C2FDAA_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7ziCR2xNQu3NfEZ7mHjF9p","mura_id":null,"path":"/issue/supplements/1906/10-13/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1606supp","volume":62,"issue":"1606supp","issue_date":"1906-10-13","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/2FCD8C68-1CF9-41EA-B9A3705A4C343A9B.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/F95B0303-4F4C-4558-BB24B558094EDBEB_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6zA9h0GQxycwvv7rr0vVLt","mura_id":null,"path":"/issue/sa/1906/10-13/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 15","volume":95,"issue":"15","issue_date":"1906-10-13","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/DBDB6CBB-495D-450B-8BE8591DD2BB71F8.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/83F29219-645D-4614-AF773BE0F1A79C5A_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3gvlHfeEqbHgzfGAgtIhjy","mura_id":null,"path":"/issue/supplements/1906/10-06/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1605supp","volume":62,"issue":"1605supp","issue_date":"1906-10-06","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/AB539BA0-DA02-446F-BE1F2F39F8CB920D.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/71826DD7-654B-4D0E-B4DB1C1FE243165F_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2042cfVAvMXNhC9ueTkMvL","mura_id":null,"path":"/issue/sa/1906/10-06/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 14","volume":95,"issue":"14","issue_date":"1906-10-06","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/BB429CE5-F06E-424B-AB730DD68F83B433.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/43BF6224-9EFE-4393-9F45B5A4ACBA1E82_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4V0xHElzCC7whrQgJ720XF","mura_id":null,"path":"/issue/sa/1906/09-29/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 13","volume":95,"issue":"13","issue_date":"1906-09-29","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/7D9AE269-31EE-461A-B671A0AF20E25085.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/EFD8922C-9BE5-49C0-923DD18D3DB4B573_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2xIetv7aS1kVSjmhyvxNLS","mura_id":null,"path":"/issue/supplements/1906/09-29/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1604supp","volume":62,"issue":"1604supp","issue_date":"1906-09-29","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/62F013DB-0155-4B66-9CBCAD2857731F35.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/4AE86B77-61DD-4731-A98B1ADC1070A8A1_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"20uxbpOLVCUvxH7cXJS2Wx","mura_id":null,"path":"/issue/supplements/1906/09-22/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1603supp","volume":62,"issue":"1603supp","issue_date":"1906-09-22","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/4D963EDB-A3B1-4556-851F99441CF20075.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/6A7B37F4-BB3C-4B93-BE18B2F51A90D1E1_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4v16BQnyKrVvHAm8ko4Znw","mura_id":null,"path":"/issue/sa/1906/09-22/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 12","volume":95,"issue":"12","issue_date":"1906-09-22","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/ECFF8B1E-7B91-400F-A4B4A56FC418E0C0.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/F025A88B-9C99-4867-BF97C6B6EE39F972_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"Q9WeumYwOsYwWPK824p9c","mura_id":null,"path":"/issue/supplements/1906/09-15/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1602supp","volume":62,"issue":"1602supp","issue_date":"1906-09-15","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/3D97E0AC-DF83-4AF8-9B48965DB8758E2C.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/7A32B543-388B-4A43-B652EC506A403CBC_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3GYv9lmJx61XimelhRLAqT","mura_id":null,"path":"/issue/sa/1906/09-15/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 11","volume":95,"issue":"11","issue_date":"1906-09-15","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E9970CFD-C242-49B2-9118C8005DDEA899.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/E80AAB84-B5BE-479B-8B7E9B242C741683_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1ZNNkZu6hDZ1epJzo7h0OU","mura_id":null,"path":"/issue/supplements/1906/09-08/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1601supp","volume":62,"issue":"1601supp","issue_date":"1906-09-08","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/4799C93B-191A-45BE-B3D89EA1D3428954.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/451FB535-F906-4ECC-860C3CF6ECED388B_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3ZWxYU9tz4RwR8w63vrX0W","mura_id":null,"path":"/issue/sa/1906/09-08/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 10","volume":95,"issue":"10","issue_date":"1906-09-08","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/0B61E6D6-ABC3-406C-924A505E5EADF941.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/C6402A91-9382-40A2-BF389890FC8D1FB0_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3g1uvB09v0aPdmYPvdSoEx","mura_id":null,"path":"/issue/supplements/1906/09-01/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1600supp","volume":62,"issue":"1600supp","issue_date":"1906-09-01","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/9BE8712C-19F5-4756-972C412ABDB011DA.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/BDDECF85-3B7C-4892-8A5B6BB07514D773_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"Kny94ivGSO6BiWiwafe3o","mura_id":null,"path":"/issue/sa/1906/09-01/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 9","volume":95,"issue":"9","issue_date":"1906-09-01","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/CA98F580-4017-46BD-983DB39589A76CFB.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/3E58D7BC-BD09-472F-9CAA52F6FEFBE225_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"52Am2RYomemrLafzTra174","mura_id":null,"path":"/issue/supplements/1906/08-25/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1599supp","volume":62,"issue":"1599supp","issue_date":"1906-08-25","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/6EF367AF-7909-47CB-B13D1EEEDE73571E.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/D9B2F48E-36CB-4B3D-8E3056388D7CAFCD_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"O3OOKlDuLVdwepvz20yjO","mura_id":null,"path":"/issue/sa/1906/08-25/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 8","volume":95,"issue":"8","issue_date":"1906-08-25","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/74186E5E-A561-45CB-850B5FDF53E641A4.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/8DADC6A2-BE8E-4904-BBA38682AD33727A_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"oqTZpvpBapYzrj3mSg9kf","mura_id":null,"path":"/issue/supplements/1906/08-18/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1598supp","volume":62,"issue":"1598supp","issue_date":"1906-08-18","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/092577F9-9AF1-44B3-B6CB2C4350F6FF09.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/F4738985-05FF-4C55-9CF9A80EACE80C7F_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2WKDRC4YvJhTMBatznAgDv","mura_id":null,"path":"/issue/sa/1906/08-18/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 7","volume":95,"issue":"7","issue_date":"1906-08-18","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/EE1725A4-58E9-4C1C-A97AEBCD6B4C91A4.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/42A94D77-16B8-45FE-825E430897662F3B_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3Nhx58n9GoAyZYvcLrF9j7","mura_id":null,"path":"/issue/sa/1906/08-11/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 6","volume":95,"issue":"6","issue_date":"1906-08-11","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/46864193-6219-4E78-994770DF7EE61F4B.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/1D4E0575-54DC-4A13-959079128ADCFBF6_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"46NteITjkldUbSSUfCRDZt","mura_id":null,"path":"/issue/supplements/1906/08-11/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1597supp","volume":62,"issue":"1597supp","issue_date":"1906-08-11","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/9C7BE7ED-EFAA-451B-90FC9B1A0CDFD25D.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/C9F1F3F4-706A-4DAA-8D6C8C4138570FC6_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2zIvWVqxpqwWghJkSKF0WQ","mura_id":null,"path":"/issue/supplements/1906/08-04/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1596supp","volume":62,"issue":"1596supp","issue_date":"1906-08-04","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D4A8D27B-3800-4DA1-B5EB147E212F6C8C.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/58F8B8F6-9F46-4BA0-98CB2AFFE8F23EB4_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3HWrRTKUs9GD7Ri1uPVxyI","mura_id":null,"path":"/issue/sa/1906/08-04/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 5","volume":95,"issue":"5","issue_date":"1906-08-04","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/C9992AA3-DE10-4F78-A52E36A9AE10D222.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/585EF542-D28A-49AD-96530E972A8EDBD8_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"16IOzYXXY2aav2cUSL2VTt","mura_id":null,"path":"/issue/supplements/1906/07-28/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1595supp","volume":62,"issue":"1595supp","issue_date":"1906-07-28","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/4CAB9D80-061E-429D-B8E2E73B4B9B1B5F.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/DA83D7A2-EE80-4B8D-B6E13E14DC2D8BF7_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2ci94OCvOaZDGAY7OgnNxI","mura_id":null,"path":"/issue/sa/1906/07-28/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 4","volume":95,"issue":"4","issue_date":"1906-07-28","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/757738B0-9C38-4F80-8C28FD4DCAEB1A75.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/4F564CD6-9E82-4ECC-9ECEA47D43E76FB6_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2wkuNVa4DUQh6oVX0RIx47","mura_id":null,"path":"/issue/supplements/1906/07-21/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1594supp","volume":62,"issue":"1594supp","issue_date":"1906-07-21","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/784A9CA2-8569-4BEE-8A0E0D03EC20EEE6.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/825203D3-95A4-46F5-95D793C09A752399_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"xNf1Zzq6yxLgI6rVMAKek","mura_id":null,"path":"/issue/sa/1906/07-21/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 3","volume":95,"issue":"3","issue_date":"1906-07-21","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/C821531A-4B7C-4306-8C8570A3A15BA865.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/D1A17CAA-5004-4430-9C55470E624CAC41_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5q9STkjXmWOIDUsomrE3bq","mura_id":null,"path":"/issue/supplements/1906/07-14/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1593supp","volume":62,"issue":"1593supp","issue_date":"1906-07-14","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E181FDCE-87DA-42A4-B9B06D6715EB825E.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/6171EA5A-4197-41B1-8D81251F9F6C25E5_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4oB5uhh6zAWK4z6kriAok9","mura_id":null,"path":"/issue/sa/1906/07-14/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 2","volume":95,"issue":"2","issue_date":"1906-07-14","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/F98E2132-7D7A-4F45-9AAA4F6A54DA40D6.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/2B654104-21AB-4BB3-A1BD313470FD5FF0_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7mB2UrGFLSjpux2N9QsthL","mura_id":null,"path":"/issue/supplements/1906/07-07/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 62, Issue 1592supp","volume":62,"issue":"1592supp","issue_date":"1906-07-07","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/244A4736-8B81-42C1-881D0A767090587F.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/A4AFAB62-6A71-4AE8-9174C69A7634FE96_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2jQRG8FwMYQgdhTNU9bUjX","mura_id":null,"path":"/issue/sa/1906/07-07/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 95, Issue 1","volume":95,"issue":"1","issue_date":"1906-07-07","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/1CBCF9DD-51D7-4B80-B0857BEAF869E728.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/238B699F-B403-404D-BCF232AF1761927B_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6vrwLnzRa91l8Us8Q5dnnL","mura_id":null,"path":"/issue/supplements/1906/06-30/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1591supp","volume":61,"issue":"1591supp","issue_date":"1906-06-30","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/82814867-0B84-404F-8FB3CD2260CF1BBA.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/75EF3411-1DD9-49AE-B88BB206CB3ACE90_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"75ZwpbW9XFJpYA2ZBBoWnY","mura_id":null,"path":"/issue/sa/1906/06-30/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 26","volume":94,"issue":"26","issue_date":"1906-06-30","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/1F1D0E3E-4D61-43E2-8A4E8EB70D620719.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/27F68B9E-9AA9-443F-829D67D2A8A454FA_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"29QECZckazpKrFIqpFSbX","mura_id":null,"path":"/issue/supplements/1906/06-23/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1590supp","volume":61,"issue":"1590supp","issue_date":"1906-06-23","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/3D8693B9-2DF4-41A8-9826A5ABE858E715.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/C142F297-10F2-4BB5-8B2BFB07B5606BEC_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6q9Eb0k3bZEABtufzoziCX","mura_id":null,"path":"/issue/sa/1906/06-23/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 25","volume":94,"issue":"25","issue_date":"1906-06-23","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/1E301ED9-196F-4EC4-A698548E74E05E89.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/8A8150A1-9C3A-47E8-B912F0F3946ACB4C_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3gwJv1NBCYqgOLktJOrLAQ","mura_id":null,"path":"/issue/supplements/1906/06-16/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1589supp","volume":61,"issue":"1589supp","issue_date":"1906-06-16","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/699D0F7A-61B6-4F25-8795F7C97DFADE45.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/1D890CB9-D0B1-497C-A98A000269DCCA6A_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5jAXpqoESynEmrCJUgo08U","mura_id":null,"path":"/issue/sa/1906/06-16/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 24","volume":94,"issue":"24","issue_date":"1906-06-16","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/EE3F355B-A4AF-4C3B-830F027BAD0226E5.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/A06D34BB-1C36-4F5A-9A1D101157820727_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3UyggQJlBarwB9g2lP4dJY","mura_id":null,"path":"/issue/supplements/1906/06-09/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1588supp","volume":61,"issue":"1588supp","issue_date":"1906-06-09","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/97C1965B-6E3B-4395-8D628EE17B47A4EE.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/B83E2685-CB49-4E5F-B0384A5D4440BD55_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6UEiccgQfw9vACBANytLYU","mura_id":null,"path":"/issue/sa/1906/06-09/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 23","volume":94,"issue":"23","issue_date":"1906-06-09","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/940CE20C-2DCE-4FE6-890A3D804D4B8108.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/7BE98983-572F-4BA2-81B962C14117EF69_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5RRIRawv7gTpZgkwIpi89W","mura_id":null,"path":"/issue/supplements/1906/06-02/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1587supp","volume":61,"issue":"1587supp","issue_date":"1906-06-02","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/BB9893F7-5FE7-4241-ACF9224B539DFBDD.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/8833546B-2BF9-4CB2-8004D02CB38CDA16_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"63l5GJwIEsnEp1UsTctkH0","mura_id":null,"path":"/issue/sa/1906/06-02/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 22","volume":94,"issue":"22","issue_date":"1906-06-02","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D3128EAA-2FF8-4D7D-80EFAD79640B4EE7.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/CA40AEDA-6552-4A0F-83D6D871C04E6ED0_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7ny0pnXqXDo2PxKTxUwN33","mura_id":null,"path":"/issue/supplements/1906/05-26/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1586supp","volume":61,"issue":"1586supp","issue_date":"1906-05-26","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/A0E0A3AB-E1E8-40F2-BCC4F4D5398799E1.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/248592F7-6E08-4477-A03D58724A34D475_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5Aart9El6g79UKFTt4L12n","mura_id":null,"path":"/issue/sa/1906/05-26/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 21","volume":94,"issue":"21","issue_date":"1906-05-26","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/4E6A5A88-6730-44CC-9568943869C225D9.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/72D58BD9-E80C-4309-A43519522911EDFB_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1fpiGm9gOHkgOcCqxxwaKg","mura_id":null,"path":"/issue/supplements/1906/05-19/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1585supp","volume":61,"issue":"1585supp","issue_date":"1906-05-19","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/8F0AAA88-E989-42BA-9294309DC5EAA404.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/21A4DC18-DBE2-4B51-94F3B53047BF4ED2_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5mmCpH2PcuwpFwiDDUUH8O","mura_id":null,"path":"/issue/sa/1906/05-19/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 20","volume":94,"issue":"20","issue_date":"1906-05-19","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/FAC7706E-0458-45AD-8C8A848CCCA75D99.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/1DBB2D74-4181-4075-AFB563CE3DF1E348_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6z9ZyhYckjtdfprUE2WLGA","mura_id":null,"path":"/issue/sa/1906/05-12/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 19","volume":94,"issue":"19","issue_date":"1906-05-12","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/1748FE52-7378-4A81-819B0F1D9AFC98BA.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/D9FE8449-83BF-4709-A3E55D2F995012DA_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5p99VOKCbewOSfIddshUu","mura_id":null,"path":"/issue/supplements/1906/05-12/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1584supp","volume":61,"issue":"1584supp","issue_date":"1906-05-12","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D2F485B7-4CBB-48F2-A2C906D244E03DEF.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/E185799F-E909-4B8F-B0065DA9E44FEE65_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3SZGXyl3rCS5Uc0d65pKK3","mura_id":null,"path":"/issue/supplements/1906/05-05/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1583supp","volume":61,"issue":"1583supp","issue_date":"1906-05-05","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/80D19F4B-1436-4E71-886060EF5AE57BE7.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/93DE0C3A-CD93-463B-BA97E8ED2BD76EF6_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1US67IB5Z1Wc0W60xVhZyL","mura_id":null,"path":"/issue/sa/1906/05-05/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 18","volume":94,"issue":"18","issue_date":"1906-05-05","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/5D3047ED-235D-47E0-A6EAA2C008742C12.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/F5A4991E-312E-4091-A6B099BC86CA184F_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2lwmHyLkEqH1vpfM83n6qG","mura_id":null,"path":"/issue/supplements/1906/04-28/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1582supp","volume":61,"issue":"1582supp","issue_date":"1906-04-28","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E37CCC63-0CBE-46AE-ACDDF922B25AB0FD.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/9E1497A1-34B9-44D2-A93FEC6B186F6D7E_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3SeEtjyFG1Zc61Q6Voo2WF","mura_id":null,"path":"/issue/sa/1906/04-28/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 17","volume":94,"issue":"17","issue_date":"1906-04-28","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/EA7A4879-DD40-4148-90817ABF68BE85F9.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/333E7604-1C9A-4123-B572F4141FBB84A9_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3INvQKbLOd6rOi3SXEyV6p","mura_id":null,"path":"/issue/supplements/1906/04-21/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1581supp","volume":61,"issue":"1581supp","issue_date":"1906-04-21","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/0A43D53A-DB86-4636-B53D64925955F939.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/EBC36E1A-FD85-4C5A-8AB4F8B64F95D165_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6BWFHdxLmwYbDnjy7sljHQ","mura_id":null,"path":"/issue/sa/1906/04-21/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 16","volume":94,"issue":"16","issue_date":"1906-04-21","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/9C17F45F-CA80-43B3-9AD9269E7BF66CF8.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/28E78A0F-496B-494D-A54CC4FC538D908D_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5EhJ8jjOZimXUeIAZd2d18","mura_id":null,"path":"/issue/supplements/1906/04-14/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1580supp","volume":61,"issue":"1580supp","issue_date":"1906-04-14","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/22D25CE5-3B65-47D5-92072DF711EE7827.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/4162CAD3-02BA-4EA2-A84EBDE66471291D_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3cn7rH3nioGUg6GJe5QAWV","mura_id":null,"path":"/issue/sa/1906/04-14/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 15","volume":94,"issue":"15","issue_date":"1906-04-14","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E2397103-5CBA-4A52-BAD7D409D2DD77A8.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/2B5E05C7-98CB-4A31-B975E2C18F070DCC_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1OmfzED3zVfeajrh6jpqg5","mura_id":null,"path":"/issue/supplements/1906/04-07/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1579supp","volume":61,"issue":"1579supp","issue_date":"1906-04-07","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/2BEBD2D0-09D4-4B41-9CC458C656DF16F2.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/045FD8F1-6578-4964-99C0D63508BAA03B_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3bgK2DnrOi7zn1bCBdGzAj","mura_id":null,"path":"/issue/sa/1906/04-07/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 14","volume":94,"issue":"14","issue_date":"1906-04-07","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/63C5B804-EE72-4CA3-9A2F7E7B726FDD4F.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/EC281B1B-CB02-4873-AE5DC2CF9B84B8A0_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1OzSP8SLbhawJbew70rWdW","mura_id":null,"path":"/issue/supplements/1906/03-31/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1578supp","volume":61,"issue":"1578supp","issue_date":"1906-03-31","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/954F182E-1417-4804-959C0488765509BC.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/2593E0B5-2D82-45FC-B100150C8C38B943_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"7bmLmOVAPRh1MDMvr31uXl","mura_id":null,"path":"/issue/sa/1906/03-31/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 13","volume":94,"issue":"13","issue_date":"1906-03-31","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/640456EA-71A0-47AE-971C665803CC6157.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/3EB2E735-F13B-4BC6-86CEF9A96050D397_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"MCGEe3OG7vbb9k2XwhM1Q","mura_id":null,"path":"/issue/supplements/1906/03-24/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1577supp","volume":61,"issue":"1577supp","issue_date":"1906-03-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/C0136B91-B0EF-4EDC-B9602CACBE68B245.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/4863C9D2-B15D-42B7-A928131838A79092_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1ujn9TaQyTuZJC1b3Hfrp1","mura_id":null,"path":"/issue/sa/1906/03-24/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 12","volume":94,"issue":"12","issue_date":"1906-03-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/248229D6-0C1E-464F-90C4145CF51C6B8B.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/DEAF414E-B46C-47C9-AA17CB27ECA1CC8E_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"fKYjF7ETM8YvjcyR71Xt4","mura_id":null,"path":"/issue/supplements/1906/03-17/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1576supp","volume":61,"issue":"1576supp","issue_date":"1906-03-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D7C29599-AA46-4752-AE67C1D5E78A4836.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/FCAA23CD-1931-4DB6-BE8EC9F319FAEEAA_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"O1Chhm1GVqpwWaL6PFHzz","mura_id":null,"path":"/issue/sa/1906/03-17/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 11","volume":94,"issue":"11","issue_date":"1906-03-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/23420B6F-0392-4823-8C2C5F111B7FBDAE.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/85B6DDF3-D802-4A62-985AFD88CEF12CBC_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3ZRVKQDopTWiJJ3GzyF8Uh","mura_id":null,"path":"/issue/supplements/1906/03-10/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1575supp","volume":61,"issue":"1575supp","issue_date":"1906-03-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/930F78F4-83B3-4A0A-855E1DBE6F98C781.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/431E7B4E-1A80-4F54-B37CDE370B8A4F18_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5BvgQjO4x2JeHB2B422TbQ","mura_id":null,"path":"/issue/sa/1906/03-10/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 10","volume":94,"issue":"10","issue_date":"1906-03-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/A53C8558-B9AD-4A8C-8B6CF27143E48ED7.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/FD2085BE-C791-4968-8F1A354D39414B09_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6JPxcArBM3030NoZGfvZ82","mura_id":null,"path":"/issue/supplements/1906/03-03/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1574supp","volume":61,"issue":"1574supp","issue_date":"1906-03-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/8D065787-C4C6-4D56-AA86B71211DF6A6A.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/6264FFC6-2AFC-40B8-96997AEDB4BFB296_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4OOaBi8hQPvdFEvqDqtrFB","mura_id":null,"path":"/issue/sa/1906/03-03/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 9","volume":94,"issue":"9","issue_date":"1906-03-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/C839D065-8DC3-4A85-A9352DCABF3F0092.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/59FF6605-1B7B-4DBF-97548F79B401E3DB_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"3a7ZbNwrloNdG4ckUbvCgc","mura_id":null,"path":"/issue/supplements/1906/02-24/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1573supp","volume":61,"issue":"1573supp","issue_date":"1906-02-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/A475B5D8-7A37-4339-AE7A348107C94D35.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/B904FAF1-6715-435F-A10EC2C7974339AF_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5VGOUo4WJ2KwwNoPifOMIh","mura_id":null,"path":"/issue/sa/1906/02-24/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 8","volume":94,"issue":"8","issue_date":"1906-02-24","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/C3A2E980-B258-48C5-9490433CE2B0ADC9.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/93FF7744-8AAB-4BF2-874EF9913BB6F282_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"4x5Y2EMi05qXFm3Zv7fONV","mura_id":null,"path":"/issue/supplements/1906/02-17/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1572supp","volume":61,"issue":"1572supp","issue_date":"1906-02-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/E702BD66-E3C6-4E77-B999421228A80317.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/6D2440BB-9AF8-4023-AFB51AC7BA0F24CE_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"sfl4grTZRCJlFYNH34I79","mura_id":null,"path":"/issue/sa/1906/02-17/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 7","volume":94,"issue":"7","issue_date":"1906-02-17","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/413321B7-3136-4984-BBDAAD05EEA6DE0E.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/01727319-5920-41F5-A445BCADB7DBE9D8_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"52meiMUISh6xbAe031t0QN","mura_id":null,"path":"/issue/supplements/1906/02-10/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1571supp","volume":61,"issue":"1571supp","issue_date":"1906-02-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/BC20AD2C-AC8C-428D-A836642E54B40C2A.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/642D2D56-4E2C-41A6-8F8AD230AACE18AE_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"64is1iDsB6qylP2YDrzBF0","mura_id":null,"path":"/issue/sa/1906/02-10/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 6","volume":94,"issue":"6","issue_date":"1906-02-10","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/20EF7F0A-1CAD-4AF6-96AC1333AA9699FC.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/8F9FC6AA-9CE6-42C2-97FFE8BF2A2F516F_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"1lRdINFP41xgE3CXCbB8yS","mura_id":null,"path":"/issue/supplements/1906/02-03/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1570supp","volume":61,"issue":"1570supp","issue_date":"1906-02-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/82F96ACB-A52B-4C84-BB3C1F62E284AC23.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/A58EFC79-1B33-4DC6-BA8643AA18ACC610_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2otPNMBWy1NYaaN9qnwFsr","mura_id":null,"path":"/issue/sa/1906/02-03/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 5","volume":94,"issue":"5","issue_date":"1906-02-03","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/0EDD5036-D2E7-4FB8-96495845CF9EA6FB.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/234C9355-2BFF-4E8A-931D9D868A250966_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"14gqD6VW4I3ACKRaXEDsMv","mura_id":null,"path":"/issue/supplements/1906/01-27/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1569supp","volume":61,"issue":"1569supp","issue_date":"1906-01-27","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/F7ACC0B9-6F27-4264-9B6930C0B64FA520.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/4C954C90-E75B-4EB6-88D29E6B7A953C2C_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6xmTEmFi5Z86a75X5CtHwm","mura_id":null,"path":"/issue/sa/1906/01-27/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 4","volume":94,"issue":"4","issue_date":"1906-01-27","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/D3F1A8DE-A681-4FE9-B7675DA8D21DF2D5.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/60B1CC00-F433-45A4-BB33A874B6884C68_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"2Zkmr8Etr6nqPhnb37RzZK","mura_id":null,"path":"/issue/supplements/1906/01-20/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1568supp","volume":61,"issue":"1568supp","issue_date":"1906-01-20","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/372E32A8-1265-45C0-8925D2ED8818F560.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/EFA02D8E-4F53-4CAD-9ED555D004FF758F_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"5R5MPOJJqN6oMmrGr6xsjU","mura_id":null,"path":"/issue/sa/1906/01-20/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 3","volume":94,"issue":"3","issue_date":"1906-01-20","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/A01E977F-B0DB-424B-9AB25ED53D9716CE.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/5F898883-4F32-4605-A5C227B42BF4AC32_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"Dt3Kt0auDRErqVvUU4lxC","mura_id":null,"path":"/issue/supplements/1906/01-13/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1567supp","volume":61,"issue":"1567supp","issue_date":"1906-01-13","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/7D33786E-C2CB-4180-A6C66837DAB7B61B.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/B4C46BDE-37CB-4B4F-B90FDEEB51177201_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"e5JyvN9IJ09G2Kukj53RK","mura_id":null,"path":"/issue/sa/1906/01-13/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 2","volume":94,"issue":"2","issue_date":"1906-01-13","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/BB660C17-1FE6-4FD0-88BDED73A664F829.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/A3D37F6E-39B7-4517-8FE2A7C7F8E837E7_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"97vHixL3bGFLsNWWVfdLT","mura_id":null,"path":"/issue/supplements/1906/01-06/","magazine_title":"SA Supplements","issue_title":"Scientific American Supplements Volume 61, Issue 1566supp","volume":61,"issue":"1566supp","issue_date":"1906-01-06","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/792AB336-DE33-45BD-8903A13295D68388.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/66219BB3-AF9C-422B-97EC709786C53954_source.gif","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null},{"contentful_id":"6fxX9iN0NfmXdWYagUNYq8","mura_id":null,"path":"/issue/sa/1906/01-06/","magazine_title":"Scientific American Magazine","issue_title":"Scientific American Volume 94, Issue 1","volume":94,"issue":"1","issue_date":"1906-01-06","pdf_file":"https://static.scientificamerican.com/sciam/cache/file/9098880F-AD5E-4C18-9532DE7168243D2D.pdf","image_url":"https://static.scientificamerican.com/sciam/cache/file/76B390A1-770B-4119-858639B0C2EC8EE2_source.jpg","image_width":440,"image_height":578,"image_alt_text":null,"image_caption":null,"image_credits":null,"cover_credits":null,"image_desktop_url":null,"image_desktop_width":0,"image_desktop_height":0,"image":null}],"startYear":1906,"endYear":1906,"meta":{"title":"Issue Archive: 1906","canonicalUrl":"https://www.scientificamerican.com/archive/issues/1906/","tags":{"description":"Browse Scientific American's archives going back to 1845","og:title":"Issue Archive: 1906","og:description":"Browse Scientific American's archives going back to 1845"}},"dataLayerContent":{"content":{"articleDoi":"","authors":[],"canonicalUrl":"https://www.scientificamerican.com/archive/issues/1906/","categories":"","collectionId":"","collectionName":"","column":"","containsMedia":"","contentId":"","contentDifficulty":"","contentModeling":[],"durability":"","editors":[],"isPartner":false,"isResalable":false,"isSyndicated":false,"journalIssueName":"","language":"en","partnerName":"","platform":"hopper","paywallExempt":null,"podcastSeries":"","primaryCategory":"","printDek":"","printTitle":"","publishedAtDate":"","publishedAtDateTime":"","publishedAtTime":"","sentiment":"","subCategory":"","title":"Issue Archive: 1906","type":"archive","updatedAtDateTime":"","advertiser":"","campaign":"","isSponsored":false},"game":{"gameId":"","puzzleType":"","set":"","dek":""}},"abTestGroup":"2"},"bundle":"issues"}`)</script> <script data-layer="footer">;OptanonWrapper=()=>{};consentQueue=[];tp=[];pdl={requireConsent:'v2'};window.dataLayer=[];;window.__ads=[];_sf_async_config={};_cbq=[]</script> </body> </html>