CINXE.COM

<!DOCTYPE html><html lang="en" dir="ltr" xmlns:article="http://ogp.me/ns/article#" xmlns:book="http://ogp.me/ns/book#" xmlns:product="http://ogp.me/ns/product#" xmlns:profile="http://ogp.me/ns/profile#" xmlns:video="http://ogp.me/ns/video#" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "><head><meta charset="utf-8" /><meta name="title" content="Encyclopedia.com | Free Online Encyclopedia" /><link rel="shortlink" href="https://www.encyclopedia.com/" /><link rel="canonical" href="https://www.encyclopedia.com/" /><meta name="description" content="Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library." /><meta name="abstract" content="Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library." /><meta name="keywords" content="Encyclopedia, Online, dictionary, and, encyclopedia, pictures, facts, and, videos, Get, information, and, homework, help, millions, articles, our, FREE, online, library" /><meta name="Generator" content="Drupal 8 (https://www.drupal.org)" /><meta name="MobileOptimized" content="width" /><meta name="HandheldFriendly" content="true" /><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=0" /><link rel="shortcut icon" href="/sites/default/files/favicon.ico" type="image/vnd.microsoft.icon" /><link rel="alternate" type="application/rss+xml" title="" href="http://www.encyclopedia.com/rss.xml" /><title>Encyclopedia.com | Free Online Encyclopedia</title> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-64847704-1', 'auto'); ga('send', 'pageview'); </script> <script data-cfasync="false">(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-W4GBLXB');</script> <script>(function(w, d) { w.adthrive = w.adthrive || {}; w.adthrive.cmd = w.adthrive.cmd || []; w.adthrive.plugin = 'adthrive-ads-1.0.41-manual'; w.adthrive.host = 'ads.adthrive.com'; var s = d.createElement('script'); s.async = true; s.referrerpolicy='no-referrer-when-downgrade'; s.src = 'https://' + w.adthrive.host + '/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=' + w.encodeURIComponent(w.location.href); var n = d.getElementsByTagName('script')[0]; n.parentNode.insertBefore(s, n); })(window, document);</script><link rel="stylesheet" media="all" href="/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nPkuzEFUTf02NmHtU.css" /><link rel="stylesheet" media="all" href="/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7i9DxnaRGocb8JzA.css" /><link rel="stylesheet" media="all" href="/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZKAL5HHw12USc5C1U.css" /> <script> var _reportClientErrors = false; var nodeType = "", rootPath = ""; var dataLayer = [{ pageType : 'home', }]; </script></head><body class="path-frontpage"> <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-W4GBLXB" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript> <a href="#main-content" class="visually-hidden focusable"> Skip to main content </a> <header><div class="container"><div class="row"><div class="col align-items-center d-flex"><div style="visibility: hidden; position: absolute; width: 0; height: 0;"> <svg xmlns="http://www.w3.org/2000/svg"> <symbol id="encyclopedia-logo"> <path fill="#00428b" d="M0 5.36h11.54v3.38h-7.6v2.16h6.88v3.14H3.94v2.27h7.7v3.38H0zM13.66 5.36h3.7l5.9 7.57V5.35h3.94V19.7h-3.48l-6.12-7.86v7.86h-3.94zM36.13 19.98a7.55 7.55 0 01-2.89-.55 7.06 7.06 0 01-2.34-1.55 7.46 7.46 0 01-2.16-5.31v-.05a7.49 7.49 0 012.15-5.3 7.2 7.2 0 012.39-1.58 7.81 7.81 0 013.02-.58 8.66 8.66 0 012 .22 6.87 6.87 0 011.65.62 6.6 6.6 0 011.35.95 7.88 7.88 0 011.08 1.2l-3 2.32a5.16 5.16 0 00-1.34-1.23 3.35 3.35 0 00-1.79-.45 3.18 3.18 0 00-1.38.3 3.31 3.31 0 00-1.07.81 3.8 3.8 0 00-.7 1.2 4.24 4.24 0 00-.26 1.48v.04a4.39 4.39 0 00.25 1.5 3.77 3.77 0 00.71 1.23 3.3 3.3 0 001.08.8 3.18 3.18 0 001.38.3 3.92 3.92 0 001.01-.12 3.1 3.1 0 00.84-.36 4.6 4.6 0 00.72-.55 8.37 8.37 0 00.67-.7l2.99 2.13a10.63 10.63 0 01-1.12 1.29A6.41 6.41 0 0140 19.06a7.18 7.18 0 01-1.72.68 8.59 8.59 0 01-2.15.24zM47.8 14.33l-5.44-8.98h4.53l2.94 5.23 2.97-5.23h4.45l-5.45 8.91v5.43h-4zM64.87 19.98a7.55 7.55 0 01-2.89-.55 7.07 7.07 0 01-2.34-1.55 7.45 7.45 0 01-2.16-5.31v-.05a7.49 7.49 0 012.15-5.3A7.2 7.2 0 0162 5.64a7.81 7.81 0 013.02-.58 8.65 8.65 0 012.01.22 6.87 6.87 0 011.65.61 6.6 6.6 0 011.35.96 7.86 7.86 0 011.08 1.2l-3 2.32a5.17 5.17 0 00-1.34-1.23 3.35 3.35 0 00-1.79-.45 3.17 3.17 0 00-1.38.3 3.3 3.3 0 00-1.07.81 3.78 3.78 0 00-.71 1.2 4.23 4.23 0 00-.26 1.48v.04a4.38 4.38 0 00.26 1.5 3.75 3.75 0 00.7 1.23 3.3 3.3 0 001.08.8 3.18 3.18 0 001.38.3 3.92 3.92 0 001.02-.12 3.1 3.1 0 00.84-.35 4.58 4.58 0 00.71-.56 8.36 8.36 0 00.67-.7l2.99 2.13a10.6 10.6 0 01-1.12 1.29 6.4 6.4 0 01-1.37 1.02 7.18 7.18 0 01-1.72.68 8.58 8.58 0 01-2.14.24zM72.4 5.36h3.97v10.86h6.95v3.47H72.4zM91.72 19.98a7.97 7.97 0 01-3.07-.58 7.56 7.56 0 01-2.44-1.59 7.32 7.32 0 01-1.6-2.36 7.2 7.2 0 01-.6-2.88v-.05a7.31 7.31 0 012.22-5.27 7.72 7.72 0 012.46-1.6 8.38 8.38 0 016.15 0 7.56 7.56 0 012.43 1.59 7.33 7.33 0 011.61 2.35 7.2 7.2 0 01.59 2.9v.03a7.31 7.31 0 01-2.22 5.28 7.72 7.72 0 01-2.46 1.6 7.97 7.97 0 01-3.07.58zm.04-3.58a3.58 3.58 0 001.5-.31 3.45 3.45 0 001.15-.83 3.85 3.85 0 00.74-1.22 4.08 4.08 0 00.26-1.48v-.04a4.07 4.07 0 00-.26-1.47 3.78 3.78 0 00-.76-1.23 3.74 3.74 0 00-1.17-.85 3.72 3.72 0 00-2.98-.01 3.58 3.58 0 00-1.15.83 3.62 3.62 0 00-.74 1.22 4.24 4.24 0 00-.25 1.47v.04a4.1 4.1 0 00.26 1.48 3.87 3.87 0 00.75 1.23 3.6 3.6 0 001.16.85 3.48 3.48 0 001.5.32zM101.58 5.23h4.1v2.09a6.49 6.49 0 011.82-1.69 5 5 0 012.68-.66 6.41 6.41 0 012.45.49 6.06 6.06 0 012.1 1.44 7.21 7.21 0 011.47 2.35 8.61 8.61 0 01.56 3.2v.05a8.61 8.61 0 01-.56 3.2 7.34 7.34 0 01-1.45 2.35 5.95 5.95 0 01-2.09 1.44 6.49 6.49 0 01-2.48.49 5.15 5.15 0 01-2.7-.65 7.22 7.22 0 01-1.8-1.51V24h-4.1zm7.54 11.26a3.3 3.3 0 001.37-.28 3.38 3.38 0 001.11-.81 3.91 3.91 0 00.77-1.26 4.52 4.52 0 00.29-1.64v-.06a4.54 4.54 0 00-.29-1.63 3.9 3.9 0 00-.77-1.27 3.4 3.4 0 00-1.11-.8 3.41 3.41 0 00-2.73 0 3.25 3.25 0 00-1.1.8 4.03 4.03 0 00-.76 1.27 4.54 4.54 0 00-.28 1.63v.06a4.54 4.54 0 00.28 1.63 4.02 4.02 0 00.75 1.27 3.24 3.24 0 001.11.8 3.3 3.3 0 001.36.3zM125.96 20.01a8.24 8.24 0 01-3-.54 6.96 6.96 0 01-2.4-1.53 7.1 7.1 0 01-1.58-2.36 7.83 7.83 0 01-.57-3.03v-.06a8.08 8.08 0 01.53-2.9 7.4 7.4 0 011.47-2.4 6.85 6.85 0 015.15-2.22 7.04 7.04 0 013.12.65 6.36 6.36 0 012.2 1.74 7.22 7.22 0 011.3 2.5 10.34 10.34 0 01.42 2.95l-.02.51-.04.57h-10.06a3.46 3.46 0 001.23 2.12 3.67 3.67 0 002.3.72 4.56 4.56 0 001.84-.35 6.22 6.22 0 001.67-1.13l2.35 2.07a7.27 7.27 0 01-2.48 1.98 7.7 7.7 0 01-3.43.71zm2.64-8.68a3.99 3.99 0 00-.97-2.22 2.69 2.69 0 00-2.07-.85 2.75 2.75 0 00-2.1.83 4.18 4.18 0 00-1.03 2.24zM140.9 19.97a6.42 6.42 0 01-2.45-.48 6.07 6.07 0 01-2.1-1.45 7.2 7.2 0 01-1.47-2.35 8.6 8.6 0 01-.55-3.2v-.05a8.6 8.6 0 01.55-3.2 7.33 7.33 0 011.46-2.34 5.92 5.92 0 012.09-1.44 6.48 6.48 0 012.47-.49 5.14 5.14 0 012.71.65 7.26 7.26 0 011.8 1.5V0h4.1v19.7h-4.1v-2.07a6.5 6.5 0 01-1.83 1.68 5 5 0 01-2.68.66zm1.06-3.48a3.3 3.3 0 001.36-.28 3.25 3.25 0 001.1-.81 4.03 4.03 0 00.76-1.27 4.55 4.55 0 00.29-1.63v-.05a4.54 4.54 0 00-.29-1.64 4.04 4.04 0 00-.75-1.27 3.26 3.26 0 00-1.1-.8 3.41 3.41 0 00-2.73 0 3.39 3.39 0 00-1.12.8 3.92 3.92 0 00-.77 1.26 4.52 4.52 0 00-.28 1.65v.05a4.55 4.55 0 00.28 1.63 3.89 3.89 0 00.77 1.27 3.38 3.38 0 001.12.81 3.3 3.3 0 001.36.28zM152.58 0h4.31v3.65h-4.3zm.11 5.23h4.1v14.46h-4.1zM204.8 20.01a8.19 8.19 0 01-3.1-.58 7.58 7.58 0 01-2.47-1.59 7.4 7.4 0 01-1.64-2.37 7.25 7.25 0 01-.59-2.92v-.06a7.25 7.25 0 01.6-2.92 7.46 7.46 0 011.64-2.39 7.8 7.8 0 012.48-1.62 8.09 8.09 0 013.13-.59 8.17 8.17 0 013.1.58 7.57 7.57 0 012.46 1.6 7.4 7.4 0 011.64 2.36 7.24 7.24 0 01.59 2.93v.05a7.25 7.25 0 01-.6 2.93 7.45 7.45 0 01-1.64 2.38 7.8 7.8 0 01-2.48 1.62 8.08 8.08 0 01-3.13.6zm.05-3.54a3.79 3.79 0 001.57-.3 3.46 3.46 0 001.17-.85 3.74 3.74 0 00.74-1.25 4.46 4.46 0 00.26-1.52v-.06a4.26 4.26 0 00-.27-1.52 3.82 3.82 0 00-2-2.13 3.61 3.61 0 00-1.53-.33 3.8 3.8 0 00-1.57.31 3.47 3.47 0 00-1.17.85 3.73 3.73 0 00-.74 1.25 4.47 4.47 0 00-.26 1.52v.05a4.27 4.27 0 00.27 1.52 3.86 3.86 0 001.98 2.14 3.59 3.59 0 001.55.32zM214.94 5.23h4.1v2.05a8.81 8.81 0 01.77-.87 5.32 5.32 0 01.93-.74 4.62 4.62 0 011.15-.51 4.98 4.98 0 011.41-.19 4.91 4.91 0 012.47.6 4.01 4.01 0 011.6 1.69 6.6 6.6 0 012.1-1.71 5.84 5.84 0 012.65-.58 4.74 4.74 0 013.59 1.35 5.51 5.51 0 011.3 3.96v9.41h-4.1v-8.06a3.36 3.36 0 00-.63-2.2 2.2 2.2 0 00-1.78-.74 2.31 2.31 0 00-1.82.74 3.21 3.21 0 00-.67 2.2v8.07h-4.1v-8.07a3.35 3.35 0 00-.62-2.2 2.2 2.2 0 00-1.78-.74 2.32 2.32 0 00-1.82.74 3.21 3.21 0 00-.66 2.2v8.07h-4.1zM171.12 12.8a6.45 6.45 0 011.05-3.53l-.16-.6a4.86 4.86 0 00-1.2-1.97 5.17 5.17 0 00-1.98-1.2 8.89 8.89 0 00-2.9-.42 13.07 13.07 0 00-3.13.32 16.1 16.1 0 00-2.48.84l1.03 3.12a13.94 13.94 0 011.9-.58 9.67 9.67 0 012.09-.2 3.46 3.46 0 012.32.68 2.47 2.47 0 01.78 1.97v.25a11.96 11.96 0 00-1.6-.43 10.06 10.06 0 00-1.92-.16 9.12 9.12 0 00-2.35.28 5.37 5.37 0 00-1.83.85 3.93 3.93 0 00-1.2 1.43 4.55 4.55 0 00-.43 2.05v.05a4.39 4.39 0 00.39 1.9 4.07 4.07 0 001.06 1.39 4.51 4.51 0 001.57.85 6.4 6.4 0 001.93.28 5.91 5.91 0 002.56-.5 5.68 5.68 0 001.8-1.34l-.02 1.57h3.97v-3.06a6.45 6.45 0 01-1.25-3.84zm-2.62 1.8a2.24 2.24 0 01-.87 1.83 3.6 3.6 0 01-2.32.7 2.63 2.63 0 01-1.6-.46 1.51 1.51 0 01-.63-1.29v-.05a1.68 1.68 0 01.75-1.49 3.63 3.63 0 012.07-.5 6.4 6.4 0 011.4.14 6.29 6.29 0 011.2.4zM193.66 14.94a7.57 7.57 0 01-1.53 1.11 3.7 3.7 0 01-1.79.42 3.58 3.58 0 01-1.5-.3 3.5 3.5 0 01-1.17-.85 3.7 3.7 0 01-.74-1.27 4.65 4.65 0 01-.26-1.56v-.05a4.45 4.45 0 01.26-1.52 3.84 3.84 0 01.73-1.25 3.5 3.5 0 011.1-.85 3.19 3.19 0 011.42-.3 3.63 3.63 0 011.85.42 6.72 6.72 0 011.44 1.16l2.5-2.7a7.65 7.65 0 00-2.36-1.78 7.83 7.83 0 00-3.4-.65 7.73 7.73 0 00-3.07.6 7.3 7.3 0 00-2.39 1.61 7.47 7.47 0 00-1.54 2.35 6.45 6.45 0 01.14 6.27 7.3 7.3 0 001.4 2.01 7.4 7.4 0 002.4 1.6 7.58 7.58 0 003 .6 7.24 7.24 0 003.5-.75 9.22 9.22 0 002.4-1.9z" class="a"/> <path fill="#f05b13" d="M181.62 12.8a4.01 4.01 0 11-4.01-4.01 4.01 4.01 0 014.01 4z"/> </symbol> </svg></div><div id="logo"> <a id="imagelink" href="/" title="Home" rel="home" class="site-branding__logo"> <svg width="237" height="24"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#encyclopedia-logo"></use></svg> </a></div></div><div class="col hdr-r justify-content-end d-flex align-items-center"><div id="search-form"><form action="https://www.encyclopedia.com/gsearch" method="get"><div class="js-form-item form-item js-form-type-search form-item-keys js-form-item-keys form-no-label"> <span class="field-preffix"> <input class="button js-form-submit form-submit" data-drupal-selector="edit-submit" type="submit" id="edit-submit" value="" /> </span> <input title="Enter the terms you wish to search for." class="searchbox form-search form-input" placeholder="What do you want to learn today?" data-drupal-selector="edit-keys" type="search" id="edit-keys" name="q" value="" size="15" maxlength="128" /> <span class="field-suffix"> <i class="fa ency-close"></i> </span></div><div data-drupal-selector="edit-actions" class="form-actions js-form-wrapper form-wrapper" id="edit-actions" > <input class="button js-form-submit form-submit" data-drupal-selector="edit-submit" type="submit" id="edit-submit" value="Search"></div></form></div> <span class="mobile-search-icon"><i class="fa ency-search"></i></span><div class="hdr-categories-container"><a id="rcLink" class="rc-link" onclick="toggleFlyout()"><span class="text" id="block-trustme-main-menu-menu">EXPLORE</span><i class="fa ency-down"></i></a><div class="rc-flyout" id="rcFlyout"><i onclick="closeOverlays();" class="fa fa-close"></i><div class="categories"> <span class="title">EXPLORE</span><ul block="block-trustme-main-menu"><li> <a href="/earth-and-environment" data-drupal-link-system-path="taxonomy/term/66206">Earth and Environment</a></li><li> <a href="/history" data-drupal-link-system-path="taxonomy/term/66213">History</a></li><li> <a href="/literature-and-arts" data-drupal-link-system-path="taxonomy/term/66208">Literature and the Arts</a></li><li> <a href="/medicine" data-drupal-link-system-path="taxonomy/term/66205">Medicine</a></li><li> <a href="/people" data-drupal-link-system-path="taxonomy/term/66211">People</a></li><li> <a href="/philosophy-and-religion" data-drupal-link-system-path="taxonomy/term/66209">Philosophy and Religion</a></li><li> <a href="/places" data-drupal-link-system-path="taxonomy/term/66214">Places</a></li><li> <a href="/plants-and-animals" data-drupal-link-system-path="taxonomy/term/66210">Plants and Animals</a></li><li> <a href="/science-and-technology" data-drupal-link-system-path="taxonomy/term/66204">Science and Technology</a></li><li> <a href="/social-sciences-and-law" data-drupal-link-system-path="taxonomy/term/66207">Social Sciences and the Law</a></li><li> <a href="/sports-and-everyday-life" data-drupal-link-system-path="taxonomy/term/66212">Sports and Everyday Life</a></li><li> <a href="/references" data-drupal-link-system-path="references">Additional References</a></li><li> <a href="https://www.encyclopedia.com/articles/">Articles</a></li><li> <a href="/daily/" title="Daily History">Daily</a></li></ul></div></div></div></div></div></div> </header><div class="print-logo"><div><div id="block-trustme-printlogo"><div><p><img alt="Encyclopedia.com -- Online dictionary and encyclopedia of facts, information, and biographies" src="/themes/custom/trustme/images/header-logo.jpg" /></p></div></div></div></div><div id="wrapper"> <a id="main-content" tabindex="-1"></a><div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas><div class="homepage"><div style="background-image: url('/sites/default/files/images/hero/enc_hero01_3.png');" id="block-heroblock" class="ency-loaded"><div class="ency-loaded mask-hero" ></div><h4>The World’s #1 Online Encyclopedia</h4><div class="clear-both hero" ><div class="ency-hero-body"><p>Search over 200 individual encyclopedias and reference books from the worlds most trusted publishers.</p></div><div class="list-img" > <img src="/sites/default/files/images/hero/OxfordLogo%402x_2.png" alt=""> <img src="/sites/default/files/images/hero/ColumbiaLogo%402x_1.png" alt=""> <img src="/sites/default/files/images/hero/CengageLogo%402x_2.png" alt=""></div><div class="ency-hero-search"><form action="https://www.encyclopedia.com/gsearch" method="get"><div class="js-form-item form-item js-form-type-search form-item-keys js-form-item-keys form-no-label"> <span class="field-preffix"> <input class="button js-form-submit form-submit" data-drupal-selector="edit-submit" type="submit" id="edit-submit" value="" /> </span> <input title="" class="searchbox form-search form-input" placeholder="What do you want to learn today?" data-drupal-selector="edit-keys" type="search" id="edit-keys" name="q" value="" size="15" maxlength="128" /> <span class="field-suffix"> <i class="fa ency-close"></i> </span></div><div data-drupal-selector="edit-actions" class="form-actions js-form-wrapper form-wrapper" id="edit-actions" > <input class="button js-form-submit form-submit" data-drupal-selector="edit-submit" type="submit" id="edit-submit" value="Search"></div></form></div><div class="clear-both hero footer-copy" ><p><a href="/about">Read more</a> about our content and why so many people love it.</p></div></div></div><div id="block-picksoftheweek"><h4>Picks of the week</h4><div class="clear-both picks-of-the-week-container container"></div></div><div id="block-lookwhosusingencyclopediacom"><h4>Look who's using encyclopedia.com</h4><div class="clear-both who-is-it-block"><div class="block-body"><p>Top universities and institutions use encyclopedia.com every day for their research.</p></div><div class="whoslooking-slider"><div class="whoslooking-item"><div> <img src="/sites/default/files/images/whouseit/a70c83d26434d18cd9089a26ad0064f6%20%281%29.png" alt="Pandemic Flu"/></div> <span>Recently researched about</span><h5>Pandemic Flu</h5> <a href="http://nieman.harvard.edu/wp-content/uploads/pod-assets/microsites/NiemanGuideToCoveringPandemicFlu/TheScience/SwineFluBasics.aspx.html">Read Here</a></div><div class="whoslooking-item"><div> <img src="/sites/default/files/images/whouseit/nasa2.png" alt="Bacteriophages"/></div> <span>Recently researched about</span><h5>Bacteriophages</h5> <a href="https://apod.nasa.gov/apod/ap080421.html">Read Here</a></div><div class="whoslooking-item"><div> <img src="/sites/default/files/images/whouseit/nytimes-logo-png-new-york-times-speaks-to-dr-derevensky-regarding-internet-gambling-fantasy-sports-betting-430.png" alt="The Anglerfish"/></div> <span>Recently researched about</span><h5>The Anglerfish</h5> <a href="https://www.nytimes.com/2019/07/29/science/anglerfish-bioluminescence-deep-sea.html">Read Here</a></div></div></div></div><div id="block-populartopics"><div class="popular-topics-container container"><div class="ency-topics"> <a href="/social-sciences-and-law/economics-business-and-labor/taxation/income-tax"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/0/627218.jpg');"><div class="mask-popular"></div> <span class="category">Taxation</span><h3>income tax</h3><p>income tax assessment levied upon individual or corporate incomes.</p></div> </a> <a href="/medicine/diseases-and-conditions/pathology/autism"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/4/2792955.jpg');"><div class="mask-popular"></div> <span class="category">Pathology</span><h3>autism</h3><p>autism , developmental disability resulting from a neurological disorder that affects the normal functioning of the brain.</p></div> </a> <a href="/philosophy-and-religion/eastern-religions/buddhism/pure-land-buddhism"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/6/2801633.jpg');"><div class="mask-popular"></div> <span class="category">Buddhism</span><h3>Pure Land Buddhism</h3><p>Pure Land Buddhism or Amidism, devotional sect of Mahayana Buddhism in China and Japan, centering on worship of the Buddha Amitabha.</p></div> </a> <a href="/history/united-states-and-canada/us-history/boston-tea-party"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/4/2793250.jpg');"><div class="mask-popular"></div> <span class="category">U.S. History</span><h3>Boston Tea Party</h3><p>Boston Tea Party 1773.</p></div> </a> <a href="/people/history/explorers-travelers-and-conquerors-biographies/hernan-cortes"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/4/2796049.jpg');"><div class="mask-popular"></div> <span class="category">Explorers, Travelers, and Conquerors: Biographies</span><h3>Hernan Cortes</h3><p>Hernán Cortés or Hernando Cortez , 1485-1547, Spanish conquistador , conqueror of Mexico.</p></div> </a> <a href="/places/britain-ireland-france-and-low-countries/french-and-benelux-physical-geography/pyrenees"><div class="ency-topic-bkg" style="background-image: url('/sites/default/files/6/2801644.jpg');"><div class="mask-popular"></div> <span class="category">French and Benelux Physical Geography</span><h3>Pyrenees</h3><p>Pyrenees , Span. Pirineos, Fr.</p></div> </a></div><div class="ency-more-topics"><h3>More topics</h3> <a href="/science-and-technology/biology-and-genetics/environmental-studies/environmentalism">environmentalism</a> <a href="/medicine/divisions-diagnostics-and-procedures/medicine/surrogate-mother">surrogate mother</a> <a href="/social-sciences-and-law/political-science-and-government/us-government/education">education</a> <a href="/sports-and-everyday-life/sports/sports/martial-arts">martial arts</a> <a href="/places/spain-portugal-italy-greece-and-balkans/spanish-and-portuguese-political-geography/barcelona">Barcelona</a></div></div></div><div id="block-codieblock"><div class="clear-both codie-block" ><div class="logo-ency"> <svg width="237" height="24"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#encyclopedia-logo"></use></svg></div><div><p>Best Online Consumer Information Service</p><p class="highlight">Award winner 2009 / 2010</p><p> </p></div></div></div><div id="block-trustme-bottomcontentad"></div><div class="views-element-container"><div class="js-view-dom-id-43ba7020c482f9e2211af23907847ffa46829d7d9fd0aa3dfd3f764b29addfdc"></div></div></div></div></div><div id="footer"> <footer><div><div class="container"><div id="block-trustme-footerad"></div></div><div id="block-trustme-sociallinks"><div><nav class="social"><a href="https://www.facebook.com/encyclopediacom" target="_blank" title="Facebook"><i><svg xmlns="http://www.w3.org/2000/svg" width="25" height="25" viewbox="0 0 13.4 25"><defs></defs><br /><path fill="#ffffff" d="M12.5 14.1H8.85V25H3.96V14.1H-.01V9.58h3.97V6.13C3.96 2.21 6.3.04 9.87.04c1.71 0 3.5.306 3.5.306v3.85H11.4c-1.94 0-2.55 1.21-2.55 2.44v2.94h4.34z"></path></svg></i></a><a href="https://twitter.com/encyclopediacom" target="_blank" title="Twitter"><i><svg xmlns="http://www.w3.org/2000/svg" width="25" height="25" viewbox="0 0 30.8 25"><defs></defs><br /><path fill="#ffffff" d="M27.6 6.23c.0196.273.0196.547.0196.82 0 8.34-6.35 17.9-17.9 17.9-3.57 0-6.89-1.04-9.69-2.83.508.0585.996.0781 1.52.0781 2.95 0 5.66-.996 7.83-2.7-2.77-.0587-5.1-1.88-5.9-4.38.391.0586.781.0976 1.19.0976.566 0 1.13-.0781 1.66-.215-2.89-.586-5.06-3.12-5.06-6.19v-.0781c.84.469 1.82.762 2.85.801-1.7-1.13-2.81-3.07-2.81-5.25 0-1.17.312-2.25.859-3.18 3.11 3.83 7.77 6.33 13 6.6-.0976-.469-.156-.957-.156-1.45 0-3.48 2.81-6.31 6.31-6.31 1.82 0 3.46.762 4.61 1.99 1.43-.273 2.79-.801 4-1.52-.469 1.46-1.46 2.7-2.77 3.48 1.27-.137 2.5-.488 3.63-.977-.859 1.25-1.93 2.36-3.16 3.26z"></path></svg></i></a><a href="https://instagram.com/encyclopediacom" target="_blank" title="Instagram"><i><svg xmlns="http://www.w3.org/2000/svg" width="25" height="25" viewbox="0 0 25 25"><defs></defs><br /><path fill="#ffffff" d="M12.5 5.95c3.55 0 6.41 2.86 6.41 6.41s-2.86 6.41-6.41 6.41-6.41-2.86-6.41-6.41 2.86-6.41 6.41-6.41zm0 10.6c2.29 0 4.17-1.87 4.17-4.17S14.8 8.21 12.5 8.21s-4.17 1.87-4.17 4.17 1.87 4.17 4.17 4.17zm8.17-10.8c0 .831-.669 1.5-1.5 1.5s-1.5-.669-1.5-1.5c0-.826.669-1.5 1.5-1.5.826 0 1.5.669 1.5 1.5zm4.25 1.52c.117 2.06.117 8.25 0 10.3-.1 2-.558 3.78-2.02 5.24-1.46 1.47-3.24 1.92-5.24 2.02-2.06.117-8.25.117-10.3 0-2-.1-3.77-.558-5.24-2.02C.65 21.35.2 19.57.1 17.57c-.117-2.06-.117-8.25 0-10.3.1-2 .552-3.78 2.02-5.24C3.59.57 5.36.11 7.36.02c2.06-.117 8.25-.117 10.3 0 2 .1 3.78.558 5.24 2.02 1.47 1.46 1.92 3.24 2.02 5.24zm-2.67 12.5c.653-1.64.502-5.55.502-7.37s.151-5.72-.502-7.37c-.441-1.1-1.28-1.94-2.38-2.38-1.64-.647-5.55-.502-7.37-.502s-5.72-.151-7.37.502c-1.1.441-1.94 1.28-2.38 2.38-.647 1.64-.502 5.55-.502 7.37s-.151 5.72.502 7.37c.441 1.1 1.28 1.94 2.38 2.38 1.64.647 5.55.502 7.37.502s5.72.151 7.37-.502c1.1-.441 1.94-1.28 2.38-2.38z"></path></svg></i></a></nav></div></div><div id="block-mailchimp"><div><div id="mc_embed_shell"> </div><link href="//cdn-images.mailchimp.com/embedcode/classic-061523.css" rel="stylesheet" type="text/css" /><style type="text/css"> <![CDATA[// ><!]]> </script></div></div><nav role="navigation" aria-labelledby="block-trustme-footer-menu" id="block-trustme-footer"><h2 class="visually-hidden" id="block-trustme-footer-menu">Footer menu</h2><ul block="block-trustme-footer"><li> <a href="/" rel="nofollow" data-drupal-link-system-path="<front>" class="is-active">Home</a></li><li> <a href="/about" rel="nofollow" data-drupal-link-system-path="node/1319859">About Us</a></li><li> <a href="/faq" rel="nofollow" data-drupal-link-system-path="node/1319856">Help</a></li><li> <a href="/emailus" rel="nofollow" data-drupal-link-system-path="contact/feedback">Site Feedback</a></li><li> <a href="/privacy" rel="nofollow" data-drupal-link-system-path="node/1319857">Privacy & Cookie Policy</a></li><li> <a href="/termsofservice" rel="nofollow" data-drupal-link-system-path="node/1319858">Terms and Conditions</a></li><li> <a href="https://www.encyclopedia.com/daily/" title="Daily Stories" rel="nofollow">Daily</a></li></ul> </nav><div id="block-trustme-copyright"><div><p><span>© 2019 Encyclopedia.com | All rights reserved.</span></p></div></div></div> </footer></div> <i class="back-to-top"> <svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 300 1792 1792"><path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/></svg> </i><div class="overlay" onclick="closeOverlays();"></div><script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","scriptPath":null,"pathPrefix":"","currentPath":"node","currentPathIsAdmin":false,"isFront":true,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"user":{"uid":0,"permissionsHash":"307da934b26902b030680024e1773791a2d0824c3979c033e76f93f811d7f7eb"}}</script><script src="/sites/default/files/js/js_c8LbWbHV1txem3q8oAzuadnL-HiBShaQH_WRviNqT_g.js"></script><script src="/sites/default/files/js/js_zqxY3WQzYNR0NiKCpM5itT0--wb4EaKcun2onM0X1is.js"></script><script src="/sites/default/files/js/js_7riCSsmZKOyjnTzzQILMa9_W2mWycOMuqO6ECCFCXEk.js"></script><script src="/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7FkzcQDF4zydcT90.js"></script><script src="/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.js"></script><script src="/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.js"></script></body></html>