CINXE.COM

<!DOCTYPE html> <html lang="en-US"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="profile" href="http://gmpg.org/xfn/11"> <link rel="pingback" href="https://ncbiinsights.ncbi.nlm.nih.gov/xmlrpc.php"> <meta name='robots' content='index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1' /> <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style>   <title>Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips - NCBI Insights</title> <link rel="canonical" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/" /> <meta property="og:locale" content="en_US" /> <meta property="og:type" content="article" /> <meta property="og:title" content="Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips - NCBI Insights" /> <meta property="og:description" content="New tutorials, queries, and discovery guides now available NLM’s NCBI Bookshelf provides free access to more than 13,000 peer-reviewed books and documents in life science and health care using over a dozen formats including monographs, reviews, reference works, government publications, standards and guidelines, technical reports, and textbooks. In acknowledgement of Open Access Week, we are … Continue reading Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips →" /> <meta property="og:url" content="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/" /> <meta property="og:site_name" content="NCBI Insights" /> <meta property="article:publisher" content="https://www.facebook.com/ncbi.nlm" /> <meta property="article:published_time" content="2024-10-22T14:03:26+00:00" /> <meta property="og:image" content="https://ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png" /> <meta property="og:image:width" content="1100" /> <meta property="og:image:height" content="627" /> <meta property="og:image:type" content="image/png" /> <meta name="author" content="NCBI Staff" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:creator" content="@NCBI" /> <meta name="twitter:site" content="@NCBI" /> <meta name="twitter:label1" content="Written by" /> <meta name="twitter:data1" content="NCBI Staff" /> <meta name="twitter:label2" content="Est. reading time" /> <meta name="twitter:data2" content="3 minutes" /> <script type="application/ld+json" class="yoast-schema-graph">{"@context":"https://schema.org","@graph":[{"@type":"Article","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#article","isPartOf":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/"},"author":{"name":"NCBI Staff","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#/schema/person/4f41ea6a31cea38a9a1b1419c048e50b"},"headline":"Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips","datePublished":"2024-10-22T14:03:26+00:00","dateModified":"2024-10-22T14:03:26+00:00","mainEntityOfPage":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/"},"wordCount":483,"commentCount":0,"publisher":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#organization"},"image":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#primaryimage"},"thumbnailUrl":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1100%2C627&ssl=1","keywords":["NCBI Bookshelf"],"articleSection":["What's New"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#respond"]}]},{"@type":"WebPage","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/","url":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/","name":"Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips - NCBI Insights","isPartOf":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#website"},"primaryImageOfPage":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#primaryimage"},"image":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#primaryimage"},"thumbnailUrl":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1100%2C627&ssl=1","datePublished":"2024-10-22T14:03:26+00:00","dateModified":"2024-10-22T14:03:26+00:00","breadcrumb":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#primaryimage","url":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1100%2C627&ssl=1","contentUrl":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1100%2C627&ssl=1","width":1100,"height":627,"caption":"Books on shelves in the background. Laptop and tables in the foreground with the NCBI Bookshelf webpage on the screen. Text says: Explore NCBI Bookshelf. New tutorials, queries, and discovery guides now available."},{"@type":"BreadcrumbList","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://ncbiinsights.ncbi.nlm.nih.gov/"},{"@type":"ListItem","position":2,"name":"Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips"}]},{"@type":"WebSite","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#website","url":"https://ncbiinsights.ncbi.nlm.nih.gov/","name":"National Center for Biotechnology Information","description":"News about NCBI resources and events","publisher":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://ncbiinsights.ncbi.nlm.nih.gov/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#organization","name":"National Center for Biotechnology Information","alternateName":"NCBI","url":"https://ncbiinsights.ncbi.nlm.nih.gov/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#/schema/logo/image/","url":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2023/03/nih-nlm-ncbi-two-color.png?fit=6374%2C760&ssl=1","contentUrl":"https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2023/03/nih-nlm-ncbi-two-color.png?fit=6374%2C760&ssl=1","width":6374,"height":760,"caption":"National Center for Biotechnology Information"},"image":{"@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#/schema/logo/image/"},"sameAs":["https://www.facebook.com/ncbi.nlm","https://x.com/NCBI","https://www.linkedin.com/company/ncbinlm/"]},{"@type":"Person","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#/schema/person/4f41ea6a31cea38a9a1b1419c048e50b","name":"NCBI Staff","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https://ncbiinsights.ncbi.nlm.nih.gov/#/schema/person/image/","url":"https://secure.gravatar.com/avatar/f706d65e16bb6bb171b72b4b26f66276?s=96&d=identicon&r=g","contentUrl":"https://secure.gravatar.com/avatar/f706d65e16bb6bb171b72b4b26f66276?s=96&d=identicon&r=g","caption":"NCBI Staff"},"description":"The National Center for Biotechnology Information (NCBI), a division of the U.S. National Library of Medicine, provides access to scientific and biomedical databases, software tools for analyzing molecular data, and performs research in computational biology.","sameAs":["http://ncbiinsights.wordpress.com"],"url":"https://ncbiinsights.ncbi.nlm.nih.gov/author/ncbiinsights/"}]}</script>  <link rel='dns-prefetch' href='//secure.gravatar.com' /> <link rel='dns-prefetch' href='//stats.wp.com' /> <link rel='dns-prefetch' href='//fonts-api.wp.com' /> <link rel='dns-prefetch' href='//widgets.wp.com' /> <link rel='dns-prefetch' href='//jetpack.wordpress.com' /> <link rel='dns-prefetch' href='//s0.wp.com' /> <link rel='dns-prefetch' href='//public-api.wordpress.com' /> <link rel='dns-prefetch' href='//0.gravatar.com' /> <link rel='dns-prefetch' href='//1.gravatar.com' /> <link rel='dns-prefetch' href='//2.gravatar.com' /> <link rel='preconnect' href='//i0.wp.com' /> <link rel='preconnect' href='//c0.wp.com' /> <link href='https://fonts.gstatic.com' crossorigin rel='preconnect' /> <link rel="alternate" type="application/rss+xml" title="NCBI Insights » Feed" href="https://ncbiinsights.ncbi.nlm.nih.gov/feed/" /> <link rel="alternate" type="application/rss+xml" title="NCBI Insights » Comments Feed" href="https://ncbiinsights.ncbi.nlm.nih.gov/comments/feed/" /> <link rel="alternate" type="application/rss+xml" title="NCBI Insights » Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips Comments Feed" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/feed/" /> <script type="text/javascript"> /* <![CDATA[ */ window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/svg\/","svgExt":".svg","source":{"concatemoji":"https:\/\/ncbiinsights.ncbi.nlm.nih.gov\/wp-includes\/js\/wp-emoji-release.min.js?ver=6.7.1"}}; /*! This file is auto-generated */ !function(i,n){var o,s,e;function c(e){try{var t={supportTests:e,timestamp:(new Date).valueOf()};sessionStorage.setItem(o,JSON.stringify(t))}catch(e){}}function p(e,t,n){e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(t,0,0);var t=new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data),r=(e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(n,0,0),new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data));return t.every(function(e,t){return e===r[t]})}function u(e,t,n){switch(t){case"flag":return n(e,"\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f","\ud83c\udff3\ufe0f\u200b\u26a7\ufe0f")?!1:!n(e,"\ud83c\uddfa\ud83c\uddf3","\ud83c\uddfa\u200b\ud83c\uddf3")&&!n(e,"\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f","\ud83c\udff4\u200b\udb40\udc67\u200b\udb40\udc62\u200b\udb40\udc65\u200b\udb40\udc6e\u200b\udb40\udc67\u200b\udb40\udc7f");case"emoji":return!n(e,"\ud83d\udc26\u200d\u2b1b","\ud83d\udc26\u200b\u2b1b")}return!1}function f(e,t,n){var r="undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?new OffscreenCanvas(300,150):i.createElement("canvas"),a=r.getContext("2d",{willReadFrequently:!0}),o=(a.textBaseline="top",a.font="600 32px Arial",{});return e.forEach(function(e){o[e]=t(a,e,n)}),o}function t(e){var t=i.createElement("script");t.src=e,t.defer=!0,i.head.appendChild(t)}"undefined"!=typeof Promise&&(o="wpEmojiSettingsSupports",s=["flag","emoji"],n.supports={everything:!0,everythingExceptFlag:!0},e=new Promise(function(e){i.addEventListener("DOMContentLoaded",e,{once:!0})}),new Promise(function(t){var n=function(){try{var e=JSON.parse(sessionStorage.getItem(o));if("object"==typeof e&&"number"==typeof e.timestamp&&(new Date).valueOf()<e.timestamp+604800&&"object"==typeof e.supportTests)return e.supportTests}catch(e){}return null}();if(!n){if("undefined"!=typeof Worker&&"undefined"!=typeof OffscreenCanvas&&"undefined"!=typeof URL&&URL.createObjectURL&&"undefined"!=typeof Blob)try{var e="postMessage("+f.toString()+"("+[JSON.stringify(s),u.toString(),p.toString()].join(",")+"));",r=new Blob([e],{type:"text/javascript"}),a=new Worker(URL.createObjectURL(r),{name:"wpTestEmojiSupports"});return void(a.onmessage=function(e){c(n=e.data),a.terminate(),t(n)})}catch(e){}c(n=f(s,u,p))}t(n)}).then(function(e){for(var t in e)n.supports[t]=e[t],n.supports.everything=n.supports.everything&&n.supports[t],"flag"!==t&&(n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&n.supports[t]);n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&!n.supports.flag,n.DOMReady=!1,n.readyCallback=function(){n.DOMReady=!0}}).then(function(){return e}).then(function(){var e;n.supports.everything||(n.readyCallback(),(e=n.source||{}).concatemoji?t(e.concatemoji):e.wpemoji&&e.twemoji&&(t(e.twemoji),t(e.wpemoji)))}))}((window,document),window._wpemojiSettings); /* ]]> */ </script> <link rel='stylesheet' id='all-css-224641f47d952ee7e8a289fa6fe2b1ab' href='https://ncbiinsights.ncbi.nlm.nih.gov/_static/??-eJytUltOwzAQvBCuFd58IH4qcQAOgBx7627jF16bKrdnkxbahqpFFcrPPmbGm51dJ6FjKBCKTK5aDCRt5bSFbGVb0RnZuqg74bDNKveSSu9gpomu1r+pTvWxFmEzmkMgBu2qAZIrkh4MKnDgB+Z+kpgOWTiwSvczj+Esm3v7+T5nOhqX4JMLwqugLGSpiKCQZLhc5BFsLuHzSKuPCrkXFXfR5SoFPSTUHfc2ldmucun/rRP40ZRLBBaMo9O2Ty9GR59igLM8HcfbIvlj8BwS+wBBIyevca6M6eXboEFbbacKUJkqliUfwGCkCp3DsL2h469PsXrJuqIZvub0vCsoSelOvvO80kKAjAyh4+H/P+ujqcMieL1+s9zaks6YCsYguKuc4GDbPtL96wMOOzhj3ZRCS5XBjHYNIQb7pyVS1MhTu2gjHSTfl/rin5uHm+bp+u728f4L/iHI9w==' type='text/css' media='all' /> <style id='wp-block-library-inline-css'> .has-text-align-justify{text-align:justify;} </style> <style id='wp-emoji-styles-inline-css'> img.wp-smiley, img.emoji { display: inline !important; border: none !important; box-shadow: none !important; height: 1em !important; width: 1em !important; margin: 0 0.07em !important; vertical-align: -0.1em !important; background: none !important; padding: 0 !important; } </style> <style id='jetpack-sharing-buttons-style-inline-css'> .jetpack-sharing-buttons__services-list{display:flex;flex-direction:row;flex-wrap:wrap;gap:0;list-style-type:none;margin:5px;padding:0}.jetpack-sharing-buttons__services-list.has-small-icon-size{font-size:12px}.jetpack-sharing-buttons__services-list.has-normal-icon-size{font-size:16px}.jetpack-sharing-buttons__services-list.has-large-icon-size{font-size:24px}.jetpack-sharing-buttons__services-list.has-huge-icon-size{font-size:36px}@media print{.jetpack-sharing-buttons__services-list{display:none!important}}.editor-styles-wrapper .wp-block-jetpack-sharing-buttons{gap:0;padding-inline-start:0}ul.jetpack-sharing-buttons__services-list.has-background{padding:1.25em 2.375em} </style> <style id='classic-theme-styles-inline-css'> /*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} </style> <style id='global-styles-inline-css'> :root{--wp--preset--aspect-ratio--square: 1;--wp--preset--aspect-ratio--4-3: 4/3;--wp--preset--aspect-ratio--3-4: 3/4;--wp--preset--aspect-ratio--3-2: 3/2;--wp--preset--aspect-ratio--2-3: 2/3;--wp--preset--aspect-ratio--16-9: 16/9;--wp--preset--aspect-ratio--9-16: 9/16;--wp--preset--color--black: #000000;--wp--preset--color--cyan-bluish-gray: #abb8c3;--wp--preset--color--white: #ffffff;--wp--preset--color--pale-pink: #f78da7;--wp--preset--color--vivid-red: #cf2e2e;--wp--preset--color--luminous-vivid-orange: #ff6900;--wp--preset--color--luminous-vivid-amber: #fcb900;--wp--preset--color--light-green-cyan: #7bdcb5;--wp--preset--color--vivid-green-cyan: #00d084;--wp--preset--color--pale-cyan-blue: #8ed1fc;--wp--preset--color--vivid-cyan-blue: #0693e3;--wp--preset--color--vivid-purple: #9b51e0;--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple: linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%);--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan: linear-gradient(135deg,rgb(122,220,180) 0%,rgb(0,208,130) 100%);--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange: linear-gradient(135deg,rgba(252,185,0,1) 0%,rgba(255,105,0,1) 100%);--wp--preset--gradient--luminous-vivid-orange-to-vivid-red: linear-gradient(135deg,rgba(255,105,0,1) 0%,rgb(207,46,46) 100%);--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray: linear-gradient(135deg,rgb(238,238,238) 0%,rgb(169,184,195) 100%);--wp--preset--gradient--cool-to-warm-spectrum: linear-gradient(135deg,rgb(74,234,220) 0%,rgb(151,120,209) 20%,rgb(207,42,186) 40%,rgb(238,44,130) 60%,rgb(251,105,98) 80%,rgb(254,248,76) 100%);--wp--preset--gradient--blush-light-purple: linear-gradient(135deg,rgb(255,206,236) 0%,rgb(152,150,240) 100%);--wp--preset--gradient--blush-bordeaux: linear-gradient(135deg,rgb(254,205,165) 0%,rgb(254,45,45) 50%,rgb(107,0,62) 100%);--wp--preset--gradient--luminous-dusk: linear-gradient(135deg,rgb(255,203,112) 0%,rgb(199,81,192) 50%,rgb(65,88,208) 100%);--wp--preset--gradient--pale-ocean: linear-gradient(135deg,rgb(255,245,203) 0%,rgb(182,227,212) 50%,rgb(51,167,181) 100%);--wp--preset--gradient--electric-grass: linear-gradient(135deg,rgb(202,248,128) 0%,rgb(113,206,126) 100%);--wp--preset--gradient--midnight: linear-gradient(135deg,rgb(2,3,129) 0%,rgb(40,116,252) 100%);--wp--preset--font-size--small: 13px;--wp--preset--font-size--medium: 20px;--wp--preset--font-size--large: 36px;--wp--preset--font-size--x-large: 42px;--wp--preset--font-family--albert-sans: 'Albert Sans', sans-serif;--wp--preset--font-family--alegreya: Alegreya, serif;--wp--preset--font-family--arvo: Arvo, serif;--wp--preset--font-family--bodoni-moda: 'Bodoni Moda', serif;--wp--preset--font-family--bricolage-grotesque: 'Bricolage Grotesque', sans-serif;--wp--preset--font-family--cabin: Cabin, sans-serif;--wp--preset--font-family--chivo: Chivo, sans-serif;--wp--preset--font-family--commissioner: Commissioner, sans-serif;--wp--preset--font-family--cormorant: Cormorant, serif;--wp--preset--font-family--courier-prime: 'Courier Prime', monospace;--wp--preset--font-family--crimson-pro: 'Crimson Pro', serif;--wp--preset--font-family--dm-mono: 'DM Mono', monospace;--wp--preset--font-family--dm-sans: 'DM Sans', sans-serif;--wp--preset--font-family--dm-serif-display: 'DM Serif Display', serif;--wp--preset--font-family--domine: Domine, serif;--wp--preset--font-family--eb-garamond: 'EB Garamond', serif;--wp--preset--font-family--epilogue: Epilogue, sans-serif;--wp--preset--font-family--fahkwang: Fahkwang, sans-serif;--wp--preset--font-family--figtree: Figtree, sans-serif;--wp--preset--font-family--fira-sans: 'Fira Sans', sans-serif;--wp--preset--font-family--fjalla-one: 'Fjalla One', sans-serif;--wp--preset--font-family--fraunces: Fraunces, serif;--wp--preset--font-family--gabarito: Gabarito, system-ui;--wp--preset--font-family--ibm-plex-mono: 'IBM Plex Mono', monospace;--wp--preset--font-family--ibm-plex-sans: 'IBM Plex Sans', sans-serif;--wp--preset--font-family--ibarra-real-nova: 'Ibarra Real Nova', serif;--wp--preset--font-family--instrument-serif: 'Instrument Serif', serif;--wp--preset--font-family--inter: Inter, sans-serif;--wp--preset--font-family--josefin-sans: 'Josefin Sans', sans-serif;--wp--preset--font-family--jost: Jost, sans-serif;--wp--preset--font-family--libre-baskerville: 'Libre Baskerville', serif;--wp--preset--font-family--libre-franklin: 'Libre Franklin', sans-serif;--wp--preset--font-family--literata: Literata, serif;--wp--preset--font-family--lora: Lora, serif;--wp--preset--font-family--merriweather: Merriweather, serif;--wp--preset--font-family--montserrat: Montserrat, sans-serif;--wp--preset--font-family--newsreader: Newsreader, serif;--wp--preset--font-family--noto-sans-mono: 'Noto Sans Mono', sans-serif;--wp--preset--font-family--nunito: Nunito, sans-serif;--wp--preset--font-family--open-sans: 'Open Sans', sans-serif;--wp--preset--font-family--overpass: Overpass, sans-serif;--wp--preset--font-family--pt-serif: 'PT Serif', serif;--wp--preset--font-family--petrona: Petrona, serif;--wp--preset--font-family--piazzolla: Piazzolla, serif;--wp--preset--font-family--playfair-display: 'Playfair Display', serif;--wp--preset--font-family--plus-jakarta-sans: 'Plus Jakarta Sans', sans-serif;--wp--preset--font-family--poppins: Poppins, sans-serif;--wp--preset--font-family--raleway: Raleway, sans-serif;--wp--preset--font-family--roboto: Roboto, sans-serif;--wp--preset--font-family--roboto-slab: 'Roboto Slab', serif;--wp--preset--font-family--rubik: Rubik, sans-serif;--wp--preset--font-family--rufina: Rufina, serif;--wp--preset--font-family--sora: Sora, sans-serif;--wp--preset--font-family--source-sans-3: 'Source Sans 3', sans-serif;--wp--preset--font-family--source-serif-4: 'Source Serif 4', serif;--wp--preset--font-family--space-mono: 'Space Mono', monospace;--wp--preset--font-family--syne: Syne, sans-serif;--wp--preset--font-family--texturina: Texturina, serif;--wp--preset--font-family--urbanist: Urbanist, sans-serif;--wp--preset--font-family--work-sans: 'Work Sans', sans-serif;--wp--preset--spacing--20: 0.44rem;--wp--preset--spacing--30: 0.67rem;--wp--preset--spacing--40: 1rem;--wp--preset--spacing--50: 1.5rem;--wp--preset--spacing--60: 2.25rem;--wp--preset--spacing--70: 3.38rem;--wp--preset--spacing--80: 5.06rem;--wp--preset--shadow--natural: 6px 6px 9px rgba(0, 0, 0, 0.2);--wp--preset--shadow--deep: 12px 12px 50px rgba(0, 0, 0, 0.4);--wp--preset--shadow--sharp: 6px 6px 0px rgba(0, 0, 0, 0.2);--wp--preset--shadow--outlined: 6px 6px 0px -3px rgba(255, 255, 255, 1), 6px 6px rgba(0, 0, 0, 1);--wp--preset--shadow--crisp: 6px 6px 0px rgba(0, 0, 0, 1);}:where(.is-layout-flex){gap: 0.5em;}:where(.is-layout-grid){gap: 0.5em;}body .is-layout-flex{display: flex;}.is-layout-flex{flex-wrap: wrap;align-items: center;}.is-layout-flex > :is(*, div){margin: 0;}body .is-layout-grid{display: grid;}.is-layout-grid > :is(*, div){margin: 0;}:where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;}:where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-color{color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-color{color: var(--wp--preset--color--white) !important;}.has-pale-pink-color{color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-color{color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-color{color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-color{color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-color{color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-color{color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-color{color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-color{color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-color{color: var(--wp--preset--color--vivid-purple) !important;}.has-black-background-color{background-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-background-color{background-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-background-color{background-color: var(--wp--preset--color--white) !important;}.has-pale-pink-background-color{background-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-background-color{background-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-background-color{background-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-background-color{background-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-background-color{background-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-background-color{background-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-background-color{background-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-background-color{background-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-background-color{background-color: var(--wp--preset--color--vivid-purple) !important;}.has-black-border-color{border-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-border-color{border-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-border-color{border-color: var(--wp--preset--color--white) !important;}.has-pale-pink-border-color{border-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-border-color{border-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-border-color{border-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-border-color{border-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-border-color{border-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-border-color{border-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-border-color{border-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-border-color{border-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-border-color{border-color: var(--wp--preset--color--vivid-purple) !important;}.has-vivid-cyan-blue-to-vivid-purple-gradient-background{background: var(--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple) !important;}.has-light-green-cyan-to-vivid-green-cyan-gradient-background{background: var(--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan) !important;}.has-luminous-vivid-amber-to-luminous-vivid-orange-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange) !important;}.has-luminous-vivid-orange-to-vivid-red-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-orange-to-vivid-red) !important;}.has-very-light-gray-to-cyan-bluish-gray-gradient-background{background: var(--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray) !important;}.has-cool-to-warm-spectrum-gradient-background{background: var(--wp--preset--gradient--cool-to-warm-spectrum) !important;}.has-blush-light-purple-gradient-background{background: var(--wp--preset--gradient--blush-light-purple) !important;}.has-blush-bordeaux-gradient-background{background: var(--wp--preset--gradient--blush-bordeaux) !important;}.has-luminous-dusk-gradient-background{background: var(--wp--preset--gradient--luminous-dusk) !important;}.has-pale-ocean-gradient-background{background: var(--wp--preset--gradient--pale-ocean) !important;}.has-electric-grass-gradient-background{background: var(--wp--preset--gradient--electric-grass) !important;}.has-midnight-gradient-background{background: var(--wp--preset--gradient--midnight) !important;}.has-small-font-size{font-size: var(--wp--preset--font-size--small) !important;}.has-medium-font-size{font-size: var(--wp--preset--font-size--medium) !important;}.has-large-font-size{font-size: var(--wp--preset--font-size--large) !important;}.has-x-large-font-size{font-size: var(--wp--preset--font-size--x-large) !important;}.has-albert-sans-font-family{font-family: var(--wp--preset--font-family--albert-sans) !important;}.has-alegreya-font-family{font-family: var(--wp--preset--font-family--alegreya) !important;}.has-arvo-font-family{font-family: var(--wp--preset--font-family--arvo) !important;}.has-bodoni-moda-font-family{font-family: var(--wp--preset--font-family--bodoni-moda) !important;}.has-bricolage-grotesque-font-family{font-family: var(--wp--preset--font-family--bricolage-grotesque) !important;}.has-cabin-font-family{font-family: var(--wp--preset--font-family--cabin) !important;}.has-chivo-font-family{font-family: var(--wp--preset--font-family--chivo) !important;}.has-commissioner-font-family{font-family: var(--wp--preset--font-family--commissioner) !important;}.has-cormorant-font-family{font-family: var(--wp--preset--font-family--cormorant) !important;}.has-courier-prime-font-family{font-family: var(--wp--preset--font-family--courier-prime) !important;}.has-crimson-pro-font-family{font-family: var(--wp--preset--font-family--crimson-pro) !important;}.has-dm-mono-font-family{font-family: var(--wp--preset--font-family--dm-mono) !important;}.has-dm-sans-font-family{font-family: var(--wp--preset--font-family--dm-sans) !important;}.has-dm-serif-display-font-family{font-family: var(--wp--preset--font-family--dm-serif-display) !important;}.has-domine-font-family{font-family: var(--wp--preset--font-family--domine) !important;}.has-eb-garamond-font-family{font-family: var(--wp--preset--font-family--eb-garamond) !important;}.has-epilogue-font-family{font-family: var(--wp--preset--font-family--epilogue) !important;}.has-fahkwang-font-family{font-family: var(--wp--preset--font-family--fahkwang) !important;}.has-figtree-font-family{font-family: var(--wp--preset--font-family--figtree) !important;}.has-fira-sans-font-family{font-family: var(--wp--preset--font-family--fira-sans) !important;}.has-fjalla-one-font-family{font-family: var(--wp--preset--font-family--fjalla-one) !important;}.has-fraunces-font-family{font-family: var(--wp--preset--font-family--fraunces) !important;}.has-gabarito-font-family{font-family: var(--wp--preset--font-family--gabarito) !important;}.has-ibm-plex-mono-font-family{font-family: var(--wp--preset--font-family--ibm-plex-mono) !important;}.has-ibm-plex-sans-font-family{font-family: var(--wp--preset--font-family--ibm-plex-sans) !important;}.has-ibarra-real-nova-font-family{font-family: var(--wp--preset--font-family--ibarra-real-nova) !important;}.has-instrument-serif-font-family{font-family: var(--wp--preset--font-family--instrument-serif) !important;}.has-inter-font-family{font-family: var(--wp--preset--font-family--inter) !important;}.has-josefin-sans-font-family{font-family: var(--wp--preset--font-family--josefin-sans) !important;}.has-jost-font-family{font-family: var(--wp--preset--font-family--jost) !important;}.has-libre-baskerville-font-family{font-family: var(--wp--preset--font-family--libre-baskerville) !important;}.has-libre-franklin-font-family{font-family: var(--wp--preset--font-family--libre-franklin) !important;}.has-literata-font-family{font-family: var(--wp--preset--font-family--literata) !important;}.has-lora-font-family{font-family: var(--wp--preset--font-family--lora) !important;}.has-merriweather-font-family{font-family: var(--wp--preset--font-family--merriweather) !important;}.has-montserrat-font-family{font-family: var(--wp--preset--font-family--montserrat) !important;}.has-newsreader-font-family{font-family: var(--wp--preset--font-family--newsreader) !important;}.has-noto-sans-mono-font-family{font-family: var(--wp--preset--font-family--noto-sans-mono) !important;}.has-nunito-font-family{font-family: var(--wp--preset--font-family--nunito) !important;}.has-open-sans-font-family{font-family: var(--wp--preset--font-family--open-sans) !important;}.has-overpass-font-family{font-family: var(--wp--preset--font-family--overpass) !important;}.has-pt-serif-font-family{font-family: var(--wp--preset--font-family--pt-serif) !important;}.has-petrona-font-family{font-family: var(--wp--preset--font-family--petrona) !important;}.has-piazzolla-font-family{font-family: var(--wp--preset--font-family--piazzolla) !important;}.has-playfair-display-font-family{font-family: var(--wp--preset--font-family--playfair-display) !important;}.has-plus-jakarta-sans-font-family{font-family: var(--wp--preset--font-family--plus-jakarta-sans) !important;}.has-poppins-font-family{font-family: var(--wp--preset--font-family--poppins) !important;}.has-raleway-font-family{font-family: var(--wp--preset--font-family--raleway) !important;}.has-roboto-font-family{font-family: var(--wp--preset--font-family--roboto) !important;}.has-roboto-slab-font-family{font-family: var(--wp--preset--font-family--roboto-slab) !important;}.has-rubik-font-family{font-family: var(--wp--preset--font-family--rubik) !important;}.has-rufina-font-family{font-family: var(--wp--preset--font-family--rufina) !important;}.has-sora-font-family{font-family: var(--wp--preset--font-family--sora) !important;}.has-source-sans-3-font-family{font-family: var(--wp--preset--font-family--source-sans-3) !important;}.has-source-serif-4-font-family{font-family: var(--wp--preset--font-family--source-serif-4) !important;}.has-space-mono-font-family{font-family: var(--wp--preset--font-family--space-mono) !important;}.has-syne-font-family{font-family: var(--wp--preset--font-family--syne) !important;}.has-texturina-font-family{font-family: var(--wp--preset--font-family--texturina) !important;}.has-urbanist-font-family{font-family: var(--wp--preset--font-family--urbanist) !important;}.has-work-sans-font-family{font-family: var(--wp--preset--font-family--work-sans) !important;} :where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;} :root :where(.wp-block-pullquote){font-size: 1.5em;line-height: 1.6;} :where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;} </style> <link rel='stylesheet' id='dashicons-css' href='https://ncbiinsights.ncbi.nlm.nih.gov/wp-includes/css/dashicons.min.css?ver=6.7.1' media='all' /> <link rel='stylesheet' id='franklin-fonts-css' href='https://fonts-api.wp.com/css?family=Open+Sans%3A400%2C600%7CSource+Sans+Pro%3A400%2C700%2C900&subset=latin%2Clatin-ext' media='all' /> <style id='wcw-inlinecss-inline-css'> .widget_wpcategorieswidget ul.children{display:none;} .widget_wp_categories_widget{background:#fff; position:relative;}.widget_wp_categories_widget h2,.widget_wpcategorieswidget h2{color:#4a5f6d;font-size:20px;font-weight:400;margin:0 0 25px;line-height:24px;text-transform:uppercase}.widget_wp_categories_widget ul li,.widget_wpcategorieswidget ul li{font-size: 16px; margin: 0px; border-bottom: 1px dashed #f0f0f0; position: relative; list-style-type: none; line-height: 35px;}.widget_wp_categories_widget ul li:last-child,.widget_wpcategorieswidget ul li:last-child{border:none;}.widget_wp_categories_widget ul li a,.widget_wpcategorieswidget ul li a{display:inline-block;color:#007acc;transition:all .5s ease;-webkit-transition:all .5s ease;-ms-transition:all .5s ease;-moz-transition:all .5s ease;text-decoration:none;}.widget_wp_categories_widget ul li a:hover,.widget_wp_categories_widget ul li.active-cat a,.widget_wp_categories_widget ul li.active-cat span.post-count,.widget_wpcategorieswidget ul li a:hover,.widget_wpcategorieswidget ul li.active-cat a,.widget_wpcategorieswidget ul li.active-cat span.post-count{color:#ee546c}.widget_wp_categories_widget ul li span.post-count,.widget_wpcategorieswidget ul li span.post-count{height: 30px; min-width: 35px; text-align: center; background: #fff; color: #605f5f; border-radius: 5px; box-shadow: inset 2px 1px 3px rgba(0, 122, 204,.1); top: 0px; float: right; margin-top: 2px;}li.cat-item.cat-have-child > span.post-count{float:inherit;}li.cat-item.cat-item-7.cat-have-child { background: #f8f9fa; }li.cat-item.cat-have-child > span.post-count:before { content: "("; }li.cat-item.cat-have-child > span.post-count:after { content: ")"; }.cat-have-child.open-m-menu ul.children li { border-top: 1px solid #d8d8d8;border-bottom:none;}li.cat-item.cat-have-child:after{ position: absolute; right: 8px; top: 8px; background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAABmJLR0QA/wD/AP+gvaeTAAAAoklEQVQ4je3PzQpBURSG4WfknztxGS6BKOIaDQwkSXJTnI7J2rXbhSND3lqTtb/19m3+NGWANVof3LTiZpAWXVxQY4t2A0k7snXcdmGMKpY1dui8kHQik/JVOMAC9+zxlFfO6GFfSDZlaI5bFjpjWEgOhWT9rHYpu2CEPo7Z/v5KklgW37zG5JLlO0liVjTLJaumkmeyj5qUTEP2lSQxiflVHtR5PTMAQTkfAAAAAElFTkSuQmCC); content: ""; width: 18px; height: 18px;transform: rotate(270deg);}ul.children li.cat-item.cat-have-child:after{content:"";background-image: none;}.cat-have-child ul.children {display: none; z-index: 9; width: auto; position: relative; margin: 0px; padding: 0px; margin-top: 0px; padding-top: 10px; padding-bottom: 10px; list-style: none; text-align: left; background: #f8f9fa; padding-left: 5px;}.widget_wp_categories_widget ul li ul.children li,.widget_wpcategorieswidget ul li ul.children li { border-bottom: 1px solid #fff; padding-right: 5px; }.cat-have-child.open-m-menu ul.children{display:block;}li.cat-item.cat-have-child.open-m-menu:after{transform: rotate(0deg);}.widget_wp_categories_widget > li.product_cat,.widget_wpcategorieswidget > li.product_cat {list-style: none;}.widget_wp_categories_widget > ul,.widget_wpcategorieswidget > ul {padding: 0px;}.widget_wp_categories_widget > ul li ul ,.widget_wpcategorieswidget > ul li ul {padding-left: 15px;} .wcwpro-list{padding: 0 15px;} </style> <style id='jetpack-global-styles-frontend-style-inline-css'> :root { --font-headings: unset; --font-base: unset; --font-headings-default: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif; --font-base-default: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;} </style> <script type="text/javascript" src="https://ncbiinsights.ncbi.nlm.nih.gov/wp-includes/js/jquery/jquery.min.js?ver=3.7.1" id="jquery-core-js"></script> <script type="text/javascript" id="jquery-core-js-after"> /* <![CDATA[ */ jQuery(document).ready(function($){ jQuery('li.cat-item:has(ul.children)').addClass('cat-have-child'); jQuery('.cat-have-child').removeClass('open-m-menu');jQuery('li.cat-have-child > a').click(function(){window.location.href=jQuery(this).attr('href');return false;});jQuery('li.cat-have-child').click(function(){ var li_parentdiv = jQuery(this).parent().parent().parent().attr('class'); if(jQuery(this).hasClass('open-m-menu')){jQuery('.cat-have-child').removeClass('open-m-menu');}else{jQuery('.cat-have-child').removeClass('open-m-menu');jQuery(this).addClass('open-m-menu');}});}); /* ]]> */ </script> <script type='text/javascript' src='https://ncbiinsights.ncbi.nlm.nih.gov/wp-includes/js/jquery/jquery-migrate.min.js?m=1686289764'></script> <script type="text/javascript" id="jetpack-mu-wpcom-settings-js-before"> /* <![CDATA[ */ var JETPACK_MU_WPCOM_SETTINGS = {"assetsUrl":"https:\/\/ncbiinsights.ncbi.nlm.nih.gov\/wp-content\/mu-plugins\/wpcomsh\/vendor\/automattic\/jetpack-mu-wpcom\/src\/build\/"}; /* ]]> */ </script> <script async src="https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date());gtag('config', 'G-DP2X732JSX');</script> <!- end of Google Analytics Code Snippet by GA4WP--><link rel="https://api.w.org/" href="https://ncbiinsights.ncbi.nlm.nih.gov/wp-json/" /><link rel="alternate" title="JSON" type="application/json" href="https://ncbiinsights.ncbi.nlm.nih.gov/wp-json/wp/v2/posts/14079" /><link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://ncbiinsights.ncbi.nlm.nih.gov/xmlrpc.php?rsd" /> <link rel='shortlink' href='https://wp.me/p2Tuqy-3F5' /> <link rel="alternate" title="oEmbed (JSON)" type="application/json+oembed" href="https://ncbiinsights.ncbi.nlm.nih.gov/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fncbiinsights.ncbi.nlm.nih.gov%2F2024%2F10%2F22%2Fncbi-bookshelf-learning-tools%2F" /> <link rel="alternate" title="oEmbed (XML)" type="text/xml+oembed" href="https://ncbiinsights.ncbi.nlm.nih.gov/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fncbiinsights.ncbi.nlm.nih.gov%2F2024%2F10%2F22%2Fncbi-bookshelf-learning-tools%2F&format=xml" /> <style>img#wpstats{display:none}</style> <style type="text/css"> .recentcomments a { display: inline !important; padding: 0 !important; margin: 0 !important; } table.recentcommentsavatartop img.avatar, table.recentcommentsavatarend img.avatar { border: 0px; margin: 0; } table.recentcommentsavatartop a, table.recentcommentsavatarend a { border: 0px !important; background-color: transparent !important; } td.recentcommentsavatarend, td.recentcommentsavatartop { padding: 0px 0px 1px 0px; margin: 0px; } td.recentcommentstextend { border: none !important; padding: 0px 0px 2px 10px; } .rtl td.recentcommentstextend { padding: 0px 10px 2px 0px; } td.recentcommentstexttop { border: none; padding: 0px 0px 0px 10px; } .rtl td.recentcommentstexttop { padding: 0px 10px 0px 0px; } </style> <script async type="text/javascript" id="_fed_an_ua_tag" src="https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NIH&sp=query&enhlink=true"></script><link rel="amphtml" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/amp/"><link rel="icon" href="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2021/05/nlm_favicon.png?fit=32%2C32&ssl=1" sizes="32x32" /> <link rel="icon" href="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2021/05/nlm_favicon.png?fit=192%2C192&ssl=1" sizes="192x192" /> <link rel="apple-touch-icon" href="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2021/05/nlm_favicon.png?fit=180%2C180&ssl=1" /> <meta name="msapplication-TileImage" content="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2021/05/nlm_favicon.png?fit=270%2C270&ssl=1" />  <style> /* Cached: November 23, 2024 at 5:38am */ /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7lXff1jvzRPA.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7lXff8jvzRPA.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7lXff3jvzRPA.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7lXff2jvzRPA.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7lXff4jvw.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4m0qyriQwlOrhSvowK_l5-eRZDf-LHrw.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4m0qyriQwlOrhSvowK_l5-eRZKf-LHrw.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4m0qyriQwlOrhSvowK_l5-eRZBf-LHrw.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4m0qyriQwlOrhSvowK_l5-eRZAf-LHrw.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4m0qyriQwlOrhSvowK_l5-eRZOf-I.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR71Wvf1jvzRPA.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR71Wvf8jvzRPA.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR71Wvf3jvzRPA.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR71Wvf2jvzRPA.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR71Wvf4jvw.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7NWPf1jvzRPA.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7NWPf8jvzRPA.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7NWPf3jvzRPA.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7NWPf2jvzRPA.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: italic; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4l0qyriQwlOrhSvowK_l5-eR7NWPf4jvw.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l521wRZVcf6lvg.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l521wRZXMf6lvg.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l521wRZV8f6lvg.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l521wRZVsf6lvg.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 300; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l521wRZWMf6.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-440qyriQwlOrhSvowK_l5-cSZMZ-Y.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-440qyriQwlOrhSvowK_l5-eCZMZ-Y.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-440qyriQwlOrhSvowK_l5-cyZMZ-Y.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-440qyriQwlOrhSvowK_l5-ciZMZ-Y.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 400; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-440qyriQwlOrhSvowK_l5-fCZM.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52xwNZVcf6lvg.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52xwNZXMf6lvg.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52xwNZV8f6lvg.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52xwNZVsf6lvg.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 700; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52xwNZWMf6.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52_wFZVcf6lvg.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52_wFZXMf6lvg.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* vietnamese */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52_wFZV8f6lvg.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52_wFZVsf6lvg.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Merriweather'; font-style: normal; font-weight: 900; font-display: swap; src: url(https://fonts.gstatic.com/s/merriweather/v30/u-4n0qyriQwlOrhSvowK_l52_wFZWMf6.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } :root { --font-base: sans-serif; --font-headings: Merriweather; } body, #content, .entry-content, .post-content, .page-content, .post-excerpt, .entry-summary, .entry-excerpt, .widget-area, .widget, .sidebar, #sidebar, footer, .footer, #footer, .site-footer { font-family: sans-serif; } #site-title, .site-title, #site-title a, .site-title a, .entry-title, .entry-title a, h1, h2, h3, h4, h5, h6, .widget-title, .elementor-heading-title { font-family: "Merriweather"; font-weight: 700; } </style>  </head> <body class="post-template-default single single-post postid-14079 single-format-standard franklin-child-1-0-11"> <div id="page" class="hfeed site"> <a class="skip-link screen-reader-text" href="#primary">Skip to content</a> <header id="masthead" class="site-header" role="banner"> <div class="site-header-top"> <div class="inner"> <a href="https://www.ncbi.nlm.nih.gov" class="site-description" role="img" aria-label="News about NCBI resources and events"><div>News about NCBI resources and events</div></a> <form id="header-search" action="https://ncbiinsights.ncbi.nlm.nih.gov/"> <input type="search" class="search-field" name="s" value="" /> <button type="submit" class="search-button">Search</button> </form> </div> </div> <div class="site-header-main"> <div class="inner"> <div class="site-branding"> <a href="https://ncbiinsights.ncbi.nlm.nih.gov/" class="site-logo-link" rel="home" itemprop="url"></a> <h1 class="site-title"><a href="https://ncbiinsights.ncbi.nlm.nih.gov/" rel="home">NCBI Insights</a></h1> </div> </div> </div> </header> <div id="content" class="site-content"> <div id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-14079" class="post-14079 post type-post status-publish format-standard has-post-thumbnail hentry category-whats-new tag-bookshelf"> <img width="1100" height="627" src="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=1100%2C627&ssl=1" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips" decoding="async" fetchpriority="high" srcset="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?w=1100&ssl=1 1100w, https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=300%2C171&ssl=1 300w, https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=1024%2C584&ssl=1 1024w, https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=150%2C86&ssl=1 150w, https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=768%2C438&ssl=1 768w, https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?resize=270%2C154&ssl=1 270w" sizes="(max-width: 1100px) 100vw, 1100px" data-attachment-id="14081" data-permalink="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/bookshelf_blog-3/" data-orig-file="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1100%2C627&ssl=1" data-orig-size="1100,627" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="Bookshelf_Blog (3)" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=300%2C171&ssl=1" data-large-file="https://i0.wp.com/ncbiinsights.ncbi.nlm.nih.gov/wp-content/uploads/2024/10/Bookshelf_Blog-3.png?fit=1024%2C584&ssl=1" /> <header class="entry-header"> <h1 class="entry-title">Explore NLM’s NCBI Bookshelf With New Learning Tools at Your Fingertips</h1> </header> <div class="entry-content"> <h3><i><span data-contrast="none">New tutorials, queries, and discovery guides now available</span></i><span data-ccp-props="{"201341983":0,"335557856":16777215,"335559739":0,"335559740":240}"> </span></h3> <p><span data-contrast="auto">NLM’s </span><a href="https://www.ncbi.nlm.nih.gov/books/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">NCBI Bookshelf</span></a><span data-contrast="none"> provides free access to more than 13,000 peer-reviewed books and documents in life science and health care using over a dozen formats including monographs, reviews, reference works, government publications, standards and guidelines, technical reports, and textbooks. </span><span data-contrast="none">In acknowledgement of </span><a href="https://www.openaccessweek.org/"><span data-contrast="none">Open Access Week</span></a><span data-contrast="none">, we are excited to introduce new learning tools to better access and discover subject- and format-based collections within Bookshelf.</span></p> <p><span data-contrast="none"> Bookshelf strives to advance open and equitable science and scholarship. To achieve this goal, Bookshelf collaborates with over 150 content providers, more than half of which are nontraditional publishers like government agencies and non-governmental organizations, to make their content publicly accessible. This diverse body of content is organized into user-relevant subcollections, such as “health disparities,” to better facilitate access and discovery. Over half of this content is also available for programmatic reuse through </span><a href="https://www.ncbi.nlm.nih.gov/books/about/openaccess?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">Bookshelf’s Open Access Subset</span></a><span data-contrast="auto">.</span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span><span id="more-14079"></span></p> <h5>What’s new?</h5> <p><a href="https://www.ncbi.nlm.nih.gov/books/NBK604647/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">Discovery Guides</span></a><span data-contrast="none"> – step-by-step guides on how to explore three of Bookshelf’s most used content collections:</span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <ul> <li><span style="font-size: 17px;" data-contrast="none">Toxicology literature <span data-contrast="none">– </span>over 500 reports, reviews, and reference resources from NIH, the US Environmental Protection Agency, the Agency for Toxic Substances and Disease Registry, the International Agency for Research on Cancer, and others.</span></li> <li data-leveltext="" data-font="Symbol" data-listid="2" data-list-defn-props="{"335552541":1,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="2" data-aria-level="1"><span style="font-size: 17px;">Open access online textbooks and reference works <span data-contrast="none">– </span>over 250 textbooks and 300 reference works. </span></li> <li data-leveltext="" data-font="Symbol" data-listid="2" data-list-defn-props="{"335552541":1,"335559685":1080,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"hybridMultilevel"}" aria-setsize="-1" data-aria-posinset="2" data-aria-level="1"><span style="font-size: 17px;">Clinical practice guidelines and systematic reviews <span data-contrast="none">– </span>nearly 6,000 of them from NIH, the World Health Organization (WHO), the National Institute for Health and Care Excellence and the National Institute for Health and Care Research in the UK, the Agency for Healthcare Research and Quality (AHRQ), the US Department of Veterans Affairs, and others.</span></li> </ul> <p><a href="https://www.ncbi.nlm.nih.gov/books/NBK45612/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">Video Tutorials</span></a><span data-contrast="none"> – short videos using different use cases to demonstrate easy ways to search and navigate Bookshelf.</span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <p><a href="https://www.ncbi.nlm.nih.gov/books/NBK604647/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">Subject Queries</span></a> <span data-contrast="none">–</span> <span data-contrast="none">queries on a variety of subject areas ranging from “addiction medicine” to “veterinary medicine” structured to increase the relevancy of search results. </span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <p><a href="https://www.ncbi.nlm.nih.gov/books/NBK604647/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022#findingaide.Bookshelf_Format_Queries"><span data-contrast="none">Format Queries</span></a><span data-contrast="none"> – preformatted queries that you can implement to find publications in Bookshelf in a variety of formats, including catalogs, databases, government publications, technical reports, textbooks, and more.</span><span data-ccp-props="{"335557856":16777215,"335559738":150,"335559739":0}"> </span></p> <p><span data-contrast="none">To further aid discovery of textbooks and other freely available education resources, we added an “All Textbooks” link</span> <span data-contrast="none">under the “Related Items on Bookshelf” section on the website that provides you direct access to Bookshelf’s full collection of textbooks. </span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <p><span data-contrast="none">About 75% of the clinical guidelines and systematic reviews in the Bookshelf collection are also available for mining and reuse through </span><a href="https://www.ncbi.nlm.nih.gov/books/about/ftp/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=bookshelf-new-20241022"><span data-contrast="none">Bookshelf’s FTP service</span></a><span data-contrast="none">. To facilitate programmatic access of these nearly 4,500 documents from WHO and other agencies like AHRQ, Bookshelf provides a machine-readable, structured </span><a href="https://www.ncbi.nlm.nih.gov/books/NBK604647/#findingaide.Discovery_by_Programmatic_Ac"><span data-contrast="none">Excel spreadsheet</span></a><span data-contrast="none"> that is updated monthly.</span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <h5><b><span data-contrast="none">Stay up to date </span></b><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></h5> <p><span data-contrast="none">Follow us on social </span><a href="https://twitter.com/ncbi"><span data-contrast="none">@NCBI</span></a><span data-contrast="none"> and </span><a href="https://public.govdelivery.com/accounts/USNLMOCPL/subscriber/new?topic_id=USNLMOCPL_52"><span data-contrast="none">join our mailing list</span></a><span data-contrast="none"> to keep up to date with NCBI Bookshelf and other NCBI news.    </span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <h5><b><span data-contrast="none">Questions? </span></b><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></h5> <p><span data-contrast="none">If you have questions or would like to provide feedback, please reach out to us at </span><a href="mailto:info@ncbi.nlm.nih.gov"><span data-contrast="none">info@ncbi.nlm.nih.gov</span></a><span data-contrast="none">. </span><span data-ccp-props="{"134233117":true,"134233118":true,"201341983":0,"335557856":16777215,"335559740":240}"> </span></p> <div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this post:</h3><div class="sd-content"><ul><li class="share-twitter"><a rel="nofollow noopener noreferrer" data-shared="sharing-twitter-14079" class="share-twitter sd-button share-icon" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/?share=twitter" target="_blank" title="Click to share on Twitter" ><span>Twitter</span></a></li><li class="share-facebook"><a rel="nofollow noopener noreferrer" data-shared="sharing-facebook-14079" class="share-facebook sd-button share-icon" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/?share=facebook" target="_blank" title="Click to share on Facebook" ><span>Facebook</span></a></li><li class="share-print"><a rel="nofollow noopener noreferrer" data-shared="" class="share-print sd-button share-icon" href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/#print" target="_blank" title="Click to print" ><span>Print</span></a></li><li class="share-email"><a rel="nofollow noopener noreferrer" data-shared="" class="share-email sd-button share-icon" href="mailto:?subject=%5BShared%20Post%5D%20Explore%20NLM%E2%80%99s%20NCBI%20Bookshelf%20With%20New%20Learning%20Tools%20at%20Your%20Fingertips&body=https%3A%2F%2Fncbiinsights.ncbi.nlm.nih.gov%2F2024%2F10%2F22%2Fncbi-bookshelf-learning-tools%2F&share=email" target="_blank" title="Click to email a link to a friend" data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="483adc57bb" data-email-share-track-url="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/?share=email"><span>Email</span></a></li><li class="share-end"></li></ul></div></div></div><div class='sharedaddy sd-block sd-like jetpack-likes-widget-wrapper jetpack-likes-widget-unloaded' id='like-post-wrapper-42777678-14079-674241eff2c11' data-src='https://widgets.wp.com/likes/?ver=14.1-a.3#blog_id=42777678&post_id=14079&origin=ncbiinsights.ncbi.nlm.nih.gov&obj_id=42777678-14079-674241eff2c11&n=1' data-name='like-post-frame-42777678-14079-674241eff2c11' data-title='Like or Reblog'><h3 class="sd-title">Like this:</h3><div class='likes-widget-placeholder post-likes-widget-placeholder' style='height: 55px;'><span class='button'><span>Like</span></span> <span class="loading">Loading...</span></div><span class='sd-text-color'></span><a class='sd-link-color'></a></div> <ul class="post-categories"><li><a href="https://ncbiinsights.ncbi.nlm.nih.gov/category/whats-new/" rel="category tag">What's New</a></ul> </div> <footer class="entry-footer"> <ul class="post-meta"><li class="author vcard"><a class="url fn n" href="https://ncbiinsights.ncbi.nlm.nih.gov/author/ncbiinsights/">NCBI Staff</a></li><li class="posted-on"><time class="entry-date published updated" datetime="2024-10-22T10:03:26-04:00">October 22, 2024</time></li></ul> <div class="meta-wrapper"> <ul class="post-tags"><li><a href="https://ncbiinsights.ncbi.nlm.nih.gov/tag/bookshelf/" rel="tag">NCBI Bookshelf</a></li></ul> </div> <nav class="navigation post-navigation" aria-label="Posts"> <h2 class="screen-reader-text">Post navigation</h2> <div class="nav-links"><div class="nav-previous"><a href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/21/pubmed-central-updated-website/" rel="prev">PubMed Central (PMC) Transitions to Updated Website</a></div><div class="nav-next"><a href="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/23/changes-ncbis-biosample-database/" rel="next">Upcoming Changes to NCBI’s BioSample Database</a></div></div> </nav> </footer> </article> <div id="comments" class="comments-area"> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title">Leave a Reply<small><a rel="nofollow" id="cancel-comment-reply-link" href="/2024/10/22/ncbi-bookshelf-learning-tools/#respond" style="display:none;">Cancel reply</a></small></h3> <form id="commentform" class="comment-form"> <iframe title="Comment Form" src="https://jetpack.wordpress.com/jetpack-comment/?blogid=42777678&postid=14079&comment_registration=0&require_name_email=1&stc_enabled=1&stb_enabled=1&show_avatars=1&avatar_default=identicon&greeting=Leave+a+Reply&jetpack_comments_nonce=e826b566fe&greeting_reply=Leave+a+Reply+to+%25s&color_scheme=light&lang=en_US&jetpack_version=14.1-a.3&iframe_unique_id=1&show_cookie_consent=10&has_cookie_consent=0&is_current_user_subscribed=0&token_key=%3Bnormal%3B&sig=6a2240a579040968b5b40a3fb48ece2325066aca#parent=https%3A%2F%2Fncbiinsights.ncbi.nlm.nih.gov%2F2024%2F10%2F22%2Fncbi-bookshelf-learning-tools%2F" name="jetpack_remote_comment" style="width:100%; height: 430px; border:0;" class="jetpack_remote_comment" id="jetpack_remote_comment" sandbox="allow-same-origin allow-top-navigation allow-scripts allow-forms allow-popups" > </iframe>  <script> document.addEventListener('DOMContentLoaded', function () { var commentForms = document.getElementsByClassName('jetpack_remote_comment'); for (var i = 0; i < commentForms.length; i++) { commentForms[i].allowTransparency = false; commentForms[i].scrolling = 'no'; } }); </script>  </form> </div> <input type="hidden" name="comment_parent" id="comment_parent" value="" /> </div> </main> </div> <div id="secondary" class="widget-area" role="complementary"> <aside id="custom_html-2" class="widget_text widget widget_custom_html"><h2 class="widget-title">About NCBI</h2><div class="textwidget custom-html-widget"><ul> <li><a href="/about/">About This Blog</a></li> <li><a href="https://ncbi.nlm.nih.gov/">NCBI Website</a></li> </ul></div></aside><aside id="custom_html-4" class="widget_text widget widget_custom_html"><h2 class="widget-title">NCBI Outreach Events</h2><div class="textwidget custom-html-widget"><ul> <li><a href="/event_listing_type/ncbi-workshop">Workshops</a><br/><em>Hands-on, interactive training sessions</em></li> <li><a href="/event_listing_type/ncbi-codeathon">Codeathons</a><br/><em>Collaborative project-based events</em></li> <li><a href="/event_listing_type/ncbi-conference/">Conferences</a><br/><em>NCBI activities at scientific meetings</em></li> <li><a href="/ncbi-outreach-events/">View all events</a><br/></li> </ul></div></aside><aside id="custom_html-3" class="widget_text widget widget_custom_html"><h2 class="widget-title">Subscribe to our mailing lists</h2><div class="textwidget custom-html-widget"> <ul><li><a href="https://public.govdelivery.com/accounts/USNLMOCPL/subscriber/new?topic_id=USNLMOCPL_52">NCBI Announcements</a><br/> <em>Updates about our resources and events</em></li> <li><a href="https://public.govdelivery.com/accounts/USNLMOCPL/subscriber/new?topic_id=USNLMOCPL_50">NIH Comparative Genomics Resource</a><br/> <em>News on CGR-related data and tools</em></li> <li><a href="https://ncbiinsights.ncbi.nlm.nih.gov/ncbi-rss-feeds-listservs/">View all mailing lists and news feeds</a></li></ul> </div></aside><aside id="archives-3" class="widget widget_archive"><h2 class="widget-title">NCBI Insights Archives</h2> <label class="screen-reader-text" for="archives-dropdown-3">NCBI Insights Archives</label> <select id="archives-dropdown-3" name="archive-dropdown"> <option value="">Select Month</option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/11/'> November 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/'> October 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/09/'> September 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/08/'> August 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/07/'> July 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/06/'> June 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/05/'> May 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/04/'> April 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/03/'> March 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/02/'> February 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2024/01/'> January 2024 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/12/'> December 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/11/'> November 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/10/'> October 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/09/'> September 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/08/'> August 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/07/'> July 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/06/'> June 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/05/'> May 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/04/'> April 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/03/'> March 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/02/'> February 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2023/01/'> January 2023 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/12/'> December 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/11/'> November 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/10/'> October 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/09/'> September 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/08/'> August 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/07/'> July 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/06/'> June 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/05/'> May 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/04/'> April 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/03/'> March 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/02/'> February 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2022/01/'> January 2022 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/12/'> December 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/11/'> November 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/10/'> October 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/09/'> September 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/08/'> August 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/07/'> July 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/06/'> June 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/05/'> May 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/04/'> April 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/03/'> March 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/02/'> February 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2021/01/'> January 2021 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/12/'> December 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/11/'> November 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/10/'> October 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/09/'> September 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/08/'> August 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/07/'> July 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/06/'> June 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/05/'> May 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/04/'> April 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/03/'> March 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/02/'> February 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2020/01/'> January 2020 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/12/'> December 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/11/'> November 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/10/'> October 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/09/'> September 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/08/'> August 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/07/'> July 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/06/'> June 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/05/'> May 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/04/'> April 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/03/'> March 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/02/'> February 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2019/01/'> January 2019 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/12/'> December 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/11/'> November 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/10/'> October 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/09/'> September 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/08/'> August 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/07/'> July 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/06/'> June 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/05/'> May 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/04/'> April 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/03/'> March 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/02/'> February 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2018/01/'> January 2018 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/12/'> December 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/11/'> November 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/10/'> October 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/09/'> September 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/08/'> August 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/07/'> July 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/06/'> June 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/05/'> May 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/04/'> April 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/03/'> March 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/02/'> February 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2017/01/'> January 2017 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/12/'> December 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/11/'> November 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/10/'> October 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/09/'> September 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/07/'> July 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/05/'> May 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/03/'> March 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/02/'> February 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2016/01/'> January 2016 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/12/'> December 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/10/'> October 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/09/'> September 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/08/'> August 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/07/'> July 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/05/'> May 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/04/'> April 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/03/'> March 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2015/02/'> February 2015 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/12/'> December 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/10/'> October 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/08/'> August 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/06/'> June 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/05/'> May 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/04/'> April 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/03/'> March 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2014/01/'> January 2014 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/12/'> December 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/11/'> November 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/10/'> October 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/09/'> September 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/07/'> July 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/06/'> June 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/05/'> May 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/04/'> April 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/03/'> March 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/02/'> February 2013 </option> <option value='https://ncbiinsights.ncbi.nlm.nih.gov/2013/01/'> January 2013 </option> </select> <script type="text/javascript"> /* <![CDATA[ */ (function() { var dropdown = document.getElementById( "archives-dropdown-3" ); function onSelectChange() { if ( dropdown.options[ dropdown.selectedIndex ].value !== '' ) { document.location.href = this.options[ this.selectedIndex ].value; } } dropdown.onchange = onSelectChange; })(); /* ]]> */ </script> </aside><aside id="block-2" class="widget widget_block"><a href="https://www.ncbi.nlm.nih.gov/books/NBK1969/">NCBI News Archive 1994-2017</a></aside> </div> </div> <footer> <section class="icon-section"> <div id="icon-section-header" class="icon-section_header" tabindex="0">Contact NCBI on</div> <div class="grid-container"> <div class="icon-section_container"> <a class="footer-icon" id="footer_twitter" href="https://twitter.com/ncbi" aria-label="Twitter"><svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40" fill="none"> <title>Twitter</title> <g id="State=Default"> <path id="path1009" d="M6.06736 7L16.8778 20.8991L6.00001 32.2H10.2L18.6 23.1L25.668 32.2H34L22.8 17.5L31.9 7H28.4L20.7 15.4L14.401 7H6.06898H6.06736ZM9.66753 8.73423H12.9327L29.7327 30.4658H26.5697L9.66753 8.73423Z" fill="#5B616B"></path> </g> </svg></a> <a class="footer-icon" id="footer_facebook" href="https://www.facebook.com/ncbi.nlm" aria-label="Facebook"><svg data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300"> <title>Facebook</title> <path class="cls-11" d="M210.5,115.12H171.74V97.82c0-8.14,5.39-10,9.19-10h27.14V52l-39.32-.12c-35.66,0-42.42,26.68-42.42,43.77v19.48H99.09v36.32h27.24v109h45.41v-109h35Z"> </path> </svg></a> <a class="footer-icon" id="footer_linkedin" href="https://www.linkedin.com/company/ncbinlm" aria-label="LinkedIn"><svg data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300"> <title>LinkedIn</title> <path class="cls-11" d="M101.64,243.37H57.79v-114h43.85Zm-22-131.54h-.26c-13.25,0-21.82-10.36-21.82-21.76,0-11.65,8.84-21.15,22.33-21.15S101.7,78.72,102,90.38C102,101.77,93.4,111.83,79.63,111.83Zm100.93,52.61A17.54,17.54,0,0,0,163,182v61.39H119.18s.51-105.23,0-114H163v13a54.33,54.33,0,0,1,34.54-12.66c26,0,44.39,18.8,44.39,55.29v58.35H198.1V182A17.54,17.54,0,0,0,180.56,164.44Z"> </path> </svg></a> <a class="footer-icon" id="footer_github" href="https://github.com/ncbi" aria-label="GitHub"><svg data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300"> <defs> <style> .cls-11, .cls-12 { fill: #737373; } .cls-11 { fill-rule: evenodd; } </style> </defs> <title>GitHub</title> <path class="cls-11" d="M151.36,47.28a105.76,105.76,0,0,0-33.43,206.1c5.28,1,7.22-2.3,7.22-5.09,0-2.52-.09-10.85-.14-19.69-29.42,6.4-35.63-12.48-35.63-12.48-4.81-12.22-11.74-15.47-11.74-15.47-9.59-6.56.73-6.43.73-6.43,10.61.75,16.21,10.9,16.21,10.9,9.43,16.17,24.73,11.49,30.77,8.79,1-6.83,3.69-11.5,6.71-14.14C108.57,197.1,83.88,188,83.88,147.51a40.92,40.92,0,0,1,10.9-28.39c-1.1-2.66-4.72-13.42,1-28,0,0,8.88-2.84,29.09,10.84a100.26,100.26,0,0,1,53,0C198,88.3,206.9,91.14,206.9,91.14c5.76,14.56,2.14,25.32,1,28a40.87,40.87,0,0,1,10.89,28.39c0,40.62-24.74,49.56-48.29,52.18,3.79,3.28,7.17,9.71,7.17,19.58,0,14.15-.12,25.54-.12,29,0,2.82,1.9,6.11,7.26,5.07A105.76,105.76,0,0,0,151.36,47.28Z"> </path> <path class="cls-12" d="M85.66,199.12c-.23.52-1.06.68-1.81.32s-1.2-1.06-.95-1.59,1.06-.69,1.82-.33,1.21,1.07.94,1.6Zm-1.3-1"> </path> <path class="cls-12" d="M90,203.89c-.51.47-1.49.25-2.16-.49a1.61,1.61,0,0,1-.31-2.19c.52-.47,1.47-.25,2.17.49s.82,1.72.3,2.19Zm-1-1.08"> </path> <path class="cls-12" d="M94.12,210c-.65.46-1.71,0-2.37-.91s-.64-2.07,0-2.52,1.7,0,2.36.89.65,2.08,0,2.54Zm0,0"></path> <path class="cls-12" d="M99.83,215.87c-.58.64-1.82.47-2.72-.41s-1.18-2.06-.6-2.7,1.83-.46,2.74.41,1.2,2.07.58,2.7Zm0,0"> </path> <path class="cls-12" d="M107.71,219.29c-.26.82-1.45,1.2-2.64.85s-2-1.34-1.74-2.17,1.44-1.23,2.65-.85,2,1.32,1.73,2.17Zm0,0"> </path> <path class="cls-12" d="M116.36,219.92c0,.87-1,1.59-2.24,1.61s-2.29-.68-2.3-1.54,1-1.59,2.26-1.61,2.28.67,2.28,1.54Zm0,0"> </path> <path class="cls-12" d="M124.42,218.55c.15.85-.73,1.72-2,1.95s-2.37-.3-2.52-1.14.73-1.75,2-2,2.37.29,2.53,1.16Zm0,0"></path> </svg></a> <a class="footer-icon" id="footer_blog" href="https://ncbiinsights.ncbi.nlm.nih.gov/" aria-label="Blog"> <svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 40 40"><defs><style>.cls-1{fill:#737373;}</style></defs><path class="cls-1" d="M14,30a4,4,0,1,1-4-4,4,4,0,0,1,4,4Zm11,3A19,19,0,0,0,7.05,15a1,1,0,0,0-1,1v3a1,1,0,0,0,.93,1A14,14,0,0,1,20,33.07,1,1,0,0,0,21,34h3a1,1,0,0,0,1-1Zm9,0A28,28,0,0,0,7,6,1,1,0,0,0,6,7v3a1,1,0,0,0,1,1A23,23,0,0,1,29,33a1,1,0,0,0,1,1h3A1,1,0,0,0,34,33Z"></path></svg> </a> </div> </div> </section> <section class="container-fluid bg-primary"> <div class="container pt-5"> <div class="row mt-3"> <div class="col-lg-3 col-12"> <p><a class="text-white" href="https://www.nlm.nih.gov/socialmedia/index.html">Connect with NLM</a></p> <ul class="list-inline social_media"> <li class="list-inline-item"><a href="https://www.facebook.com/nationallibraryofmedicine" aria-label="Facebook" rel="noopener noreferrer" target="_blank"> <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 249 249" style="enable-background:new 0 0 249 249;" xml:space="preserve"> <style type="text/css"> .st10 { fill: #FFFFFF; } .st110 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } </style> <title>SM-Facebook</title> <g> <g> <path class="st10" d="M159,99.1h-24V88.4c0-5,3.3-6.2,5.7-6.2h16.8V60l-24.4-0.1c-22.1,0-26.2,16.5-26.2,27.1v12.1H90v22.5h16.9 v67.5H135v-67.5h21.7L159,99.1z"></path> </g> </g> <circle class="st110" cx="123.6" cy="123.2" r="108.2"></circle> </svg> </a> </li> <li class="list-inline-item"><a href="https://twitter.com/nlm_nih" aria-label="Twitter" target="_blank" rel="noopener noreferrer"><svg xmlns="http://www.w3.org/2000/svg" width="35" height="35" viewBox="0 0 36 35" fill="none"> <title>Twitter</title> <g id="X icon" clip-path="url(#clip0_65276_3946)"> <path id="Vector" d="M17.5006 34.6565C26.9761 34.6565 34.6575 26.9751 34.6575 17.4996C34.6575 8.02416 26.9761 0.342773 17.5006 0.342773C8.02514 0.342773 0.34375 8.02416 0.34375 17.4996C0.34375 26.9751 8.02514 34.6565 17.5006 34.6565Z" fill="#205493" stroke="white" stroke-width="1.0" stroke-miterlimit="10"></path> <path id="path1009" d="M8.54811 8.5L16.2698 18.4279L8.50001 26.5H11.5L17.5 20L22.5486 26.5H28.5L20.5 16L27 8.5H24.5L19 14.5L14.5007 8.5H8.54927H8.54811ZM11.1197 9.73873H13.4519L25.4519 25.2613H23.1926L11.1197 9.73873Z" fill="white"></path> </g> <defs> <clipPath id="clip0_65276_3946"> <rect width="35" height="35" fill="white"></rect> </clipPath> </defs> </svg></a></li> <li class="list-inline-item"><a href="https://www.youtube.com/user/NLMNIH" aria-label="Youtube" target="_blank" rel="noopener noreferrer"><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 249 249" style="enable-background:new 0 0 249 249;" xml:space="preserve"> <title>SM-Youtube</title> <style type="text/css"> .st4 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } .st5 { fill: #FFFFFF; } </style> <circle class="st4" cx="124.2" cy="123.4" r="108.2"></circle> <g transform="translate(0,-952.36218)"> <path class="st5" d="M88.4,1037.4c-10.4,0-18.7,8.3-18.7,18.7v40.1c0,10.4,8.3,18.7,18.7,18.7h72.1c10.4,0,18.7-8.3,18.7-18.7 v-40.1c0-10.4-8.3-18.7-18.7-18.7H88.4z M115.2,1058.8l29.4,17.4l-29.4,17.4V1058.8z"></path> </g> </svg></a></li> </ul> </div> <div class="col-lg-3 col-12"> <p class="address_footer text-white">National Library of Medicine<br> <a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white" target="_blank" rel="noopener noreferrer">8600 Rockville Pike<br> Bethesda, MD 20894</a></p> </div> <div class="col-lg-3 col-12 centered-lg"> <p><a href="https://www.nlm.nih.gov/copyright.html" class="text-white">Copyright</a><br> <a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white">FOIA</a><br> <a href="https://www.nlm.nih.gov/privacy.html" class="text-white">Privacy</a> <br><a href=" https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white">HHS Vulnerability Disclosure</a> </p> </div> <div class="col-lg-3 col-12 centered-lg"> <p><a class="supportLink text-white" href="https://support.nlm.nih.gov/">Help</a><br> <a href="https://www.nlm.nih.gov/accessibility.html" class="text-white">Accessibility</a><br> <a href="https://www.nlm.nih.gov/careers/careers.html" class="text-white">Careers</a></p> </div> </div> <div class="row"> <div class="col-lg-12 centered-lg"> <nav class="bottom-links"> <ul class="mt-3"> <li> <a class="text-white" href="//www.nlm.nih.gov/">NLM</a> </li> <li> <a class="text-white" href="https://www.nih.gov/">NIH</a> </li> <li> <a class="text-white" href="https://www.hhs.gov/">HHS</a> </li> <li> <a class="text-white" href="https://www.usa.gov/">USA.gov</a> </li> </ul></nav> </div> </div> </div> <button class="usa-button" id="btn_backToTop">Back To Top</button> </section> </footer> </div>  <script defer id="bilmur" data-customproperties="{"woo_active":"0"}" data-provider="wordpress.com" data-service="atomic" src="https://s0.wp.com/wp-content/js/bilmur.min.js?m=202447"></script> <div class="jetpack-subscription-modal"> <div class="jetpack-subscription-modal__modal-content"> <div class="wp-block-group has-border-color jetpack-subscription-modal__modal-content-form" style="border-color:#dddddd;border-width:1px;margin-top:0;margin-bottom:0;padding:32px"><div class="wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow"> <h2 class="wp-block-heading has-text-align-center" style="margin-top:4px;margin-bottom:10px;font-size:26px;font-style:normal;font-weight:600">Discover more from NCBI Insights</h2> <p class='has-text-align-center' style='margin-top:4px;margin-bottom:0px;font-size:15px'>Subscribe now to keep reading and get access to the full archive.</p> <div class="wp-block-jetpack-subscriptions__supports-newline is-style-compact wp-block-jetpack-subscriptions"> <div class="wp-block-jetpack-subscriptions__container is-not-subscriber"> <form action="https://wordpress.com/email-subscriptions" method="post" accept-charset="utf-8" data-blog="42777678" data-post_access_level="everybody" data-subscriber_email="" id="subscribe-blog" > <div class="wp-block-jetpack-subscriptions__form-elements"> <p id="subscribe-email"> <label id="subscribe-field-label" for="subscribe-field" class="screen-reader-text" > Type your email… </label> <input required="required" type="email" name="email" style="font-size: 16px;padding: 15px 23px 15px 23px;border-radius: 50px;border-width: 1px;" placeholder="Type your email…" value="" id="subscribe-field" title="Please fill in this field." /> </p> <p id="subscribe-submit" > <input type="hidden" name="action" value="subscribe"/> <input type="hidden" name="blog_id" value="42777678"/> <input type="hidden" name="source" value="https://ncbiinsights.ncbi.nlm.nih.gov/2024/10/22/ncbi-bookshelf-learning-tools/"/> <input type="hidden" name="sub-type" value="subscribe-block"/> <input type="hidden" name="app_source" value="atomic-subscription-modal-lo"/> <input type="hidden" name="redirect_fragment" value="subscribe-blog"/> <input type="hidden" name="lang" value="en_US"/> <input type="hidden" id="_wpnonce" name="_wpnonce" value="414c4d2865" /><input type="hidden" name="_wp_http_referer" value="/2024/10/22/ncbi-bookshelf-learning-tools/" /><input type="hidden" name="post_id" value="14079"/> <button type="submit" class="wp-block-button__link" style="font-size: 16px;padding: 15px 23px 15px 23px;margin: 0; margin-left: 10px;border-radius: 50px;border-width: 1px;" name="jetpack_subscriptions_widget" > Subscribe </button> </p> </div> </form> </div> </div> <p class="has-text-align-center jetpack-subscription-modal__close" style="margin-top:20px;font-size:14px"><a href="#">Continue reading</a></p> </div></div> </div> </div> <script type="text/javascript"> window.WPCOM_sharing_counts = {"https:\/\/ncbiinsights.ncbi.nlm.nih.gov\/2024\/10\/22\/ncbi-bookshelf-learning-tools\/":14079}; </script> <link rel='stylesheet' id='all-css-1c8b777aeaaeb93804ba0caa51e082f4' href='https://ncbiinsights.ncbi.nlm.nih.gov/wp-content/plugins/jetpack/_inc/blocks/subscriptions/view.css?m=1727160864' type='text/css' media='all' /> <script type="text/javascript" id="coblocks-tinyswiper-initializer-js-extra"> /* <![CDATA[ */ var coblocksTinyswiper = {"carouselPrevButtonAriaLabel":"Previous","carouselNextButtonAriaLabel":"Next","sliderImageAriaLabel":"Image"}; /* ]]> */ </script> <script type="text/javascript" id="subscription-modal-js-js-extra"> /* <![CDATA[ */ var subscriptionData = {"homeUrl":"ncbiinsights.ncbi.nlm.nih.gov"}; /* ]]> */ </script> <script type='text/javascript' src='https://ncbiinsights.ncbi.nlm.nih.gov/_static/??-eJyVUuluwyAMfqFRFO3o9mPao0wEnNQJGMbRNHv6OUsvTWnXij9g+ztsMwShPWWgLPMGHCTZREW9RRJ6g9aIajqVVClBTrJLMumIIa+69DCcsMGWFilJ7WvrdZ+kwZSn6kNAKEKnMnq6FbkFMj4mmZFGkQYMEO8WnbAzVCBhRmXx+yINh4BFs3CKVAvxrGftnWPnDg/ukbQtBn6T3VeBOMqCXBbhrOgOgZmD/ToIqHvOzZHVKbJA/HdjFlqlx4mvKaSnYaebEaS22C4t6DIk9RgEh3rReF2SaHC3MJ5pdlPTEYIdr0ynLfysIbayLvzxpPGOMcqMEsnA7gqygxyU7qXzplg4KrLBUs+/lbsSnFVW8GWfXsj+w//Jbe3NWexZiFdUYKPI2ON6Ptx7tX6s3p6fXtcvPwuoR5Y='></script> <script type="text/javascript" src="https://stats.wp.com/e-202447.js" id="jetpack-stats-js" data-wp-strategy="defer"></script> <script type="text/javascript" id="jetpack-stats-js-after"> /* <![CDATA[ */ _stq = window._stq || []; _stq.push([ "view", JSON.parse("{\"v\":\"ext\",\"blog\":\"42777678\",\"post\":\"14079\",\"tz\":\"-5\",\"srv\":\"ncbiinsights.ncbi.nlm.nih.gov\",\"hp\":\"atomic\",\"ac\":\"2\",\"amp\":\"0\",\"j\":\"1:14.1-a.3\"}") ]); _stq.push([ "clickTrackerInit", "42777678", "14079" ]); /* ]]> */ </script> <script defer type='text/javascript' src='https://ncbiinsights.ncbi.nlm.nih.gov/wp-content/plugins/akismet/_inc/akismet-frontend.js?m=1704837122'></script> <script type="text/javascript" id="jetpack-blocks-assets-base-url-js-before"> /* <![CDATA[ */ var Jetpack_Block_Assets_Base_Url="https://ncbiinsights.ncbi.nlm.nih.gov/wp-content/plugins/jetpack/_inc/blocks/"; /* ]]> */ </script> <script type='text/javascript' src='https://ncbiinsights.ncbi.nlm.nih.gov/_static/??wp-includes/js/dist/vendor/wp-polyfill.min.js,wp-content/plugins/jetpack/_inc/blocks/subscriptions/view.js?m=1726797335'></script> <script type="text/javascript" id="sharing-js-js-extra"> /* <![CDATA[ */ var sharing_js_options = {"lang":"en","counts":"1","is_stats_active":"1"}; /* ]]> */ </script> <script type="text/javascript" src="https://ncbiinsights.ncbi.nlm.nih.gov/wp-content/plugins/jetpack/_inc/build/sharedaddy/sharing.min.js?ver=14.1-a.3" id="sharing-js-js"></script> <script type="text/javascript" id="sharing-js-js-after"> /* <![CDATA[ */ var windowOpen; ( function () { function matches( el, sel ) { return !! ( el.matches && el.matches( sel ) || el.msMatchesSelector && el.msMatchesSelector( sel ) ); } document.body.addEventListener( 'click', function ( event ) { if ( ! event.target ) { return; } var el; if ( matches( event.target, 'a.share-twitter' ) ) { el = event.target; } else if ( event.target.parentNode && matches( event.target.parentNode, 'a.share-twitter' ) ) { el = event.target.parentNode; } if ( el ) { event.preventDefault(); // If there's another sharing window open, close it. if ( typeof windowOpen !== 'undefined' ) { windowOpen.close(); } windowOpen = window.open( el.getAttribute( 'href' ), 'wpcomtwitter', 'menubar=1,resizable=1,width=600,height=350' ); return false; } } ); } )(); var windowOpen; ( function () { function matches( el, sel ) { return !! ( el.matches && el.matches( sel ) || el.msMatchesSelector && el.msMatchesSelector( sel ) ); } document.body.addEventListener( 'click', function ( event ) { if ( ! event.target ) { return; } var el; if ( matches( event.target, 'a.share-facebook' ) ) { el = event.target; } else if ( event.target.parentNode && matches( event.target.parentNode, 'a.share-facebook' ) ) { el = event.target.parentNode; } if ( el ) { event.preventDefault(); // If there's another sharing window open, close it. if ( typeof windowOpen !== 'undefined' ) { windowOpen.close(); } windowOpen = window.open( el.getAttribute( 'href' ), 'wpcomfacebook', 'menubar=1,resizable=1,width=600,height=400' ); return false; } } ); } )(); /* ]]> */ </script> <iframe src='https://widgets.wp.com/likes/master.html?ver=20241123#ver=20241123&n=1' scrolling='no' id='likes-master' name='likes-master' style='display:none;'></iframe> <div id='likes-other-gravatars' class='wpl-new-layout' role="dialog" aria-hidden="true" tabindex="-1"><div class="likes-text"><span>%d</span></div><ul class="wpl-avatars sd-like-gravatars"></ul></div> <script type="text/javascript"> (function () { const iframe = document.getElementById( 'jetpack_remote_comment' ); const watchReply = function() { // Check addComment._Jetpack_moveForm to make sure we don't monkey-patch twice. if ( 'undefined' !== typeof addComment && ! addComment._Jetpack_moveForm ) { // Cache the Core function. addComment._Jetpack_moveForm = addComment.moveForm; const commentParent = document.getElementById( 'comment_parent' ); const cancel = document.getElementById( 'cancel-comment-reply-link' ); function tellFrameNewParent ( commentParentValue ) { const url = new URL( iframe.src ); if ( commentParentValue ) { url.searchParams.set( 'replytocom', commentParentValue ) } else { url.searchParams.delete( 'replytocom' ); } if( iframe.src !== url.href ) { iframe.src = url.href; } }; cancel.addEventListener( 'click', function () { tellFrameNewParent( false ); } ); addComment.moveForm = function ( _, parentId ) { tellFrameNewParent( parentId ); return addComment._Jetpack_moveForm.apply( null, arguments ); }; } } document.addEventListener( 'DOMContentLoaded', watchReply ); // In WP 6.4+, the script is loaded asynchronously, so we need to wait for it to load before we monkey-patch the functions it introduces. document.querySelector('#comment-reply-js')?.addEventListener( 'load', watchReply ); const commentIframes = document.getElementsByClassName('jetpack_remote_comment'); window.addEventListener('message', function(event) { if (event.origin !== 'https://jetpack.wordpress.com') { return; } if (!event?.data?.iframeUniqueId && !event?.data?.height) { return; } const eventDataUniqueId = event.data.iframeUniqueId; // Change height for the matching comment iframe for (let i = 0; i < commentIframes.length; i++) { const iframe = commentIframes[i]; const url = new URL(iframe.src); const iframeUniqueIdParam = url.searchParams.get('iframe_unique_id'); if (iframeUniqueIdParam == event.data.iframeUniqueId) { iframe.style.height = event.data.height + 'px'; return; } } }); })(); </script> </body> </html>