CINXE.COM
Vísindavefurinn
<!DOCTYPE html> <!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7" lang="is" xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="https://www.facebook.com/2008/fbml" xml:lang="is" lang="is"> <![endif]--> <!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8" lang="is" xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="https://www.facebook.com/2008/fbml" xml:lang="is" lang="is"> <![endif]--> <!--[if IE 8]> <html class="no-js lt-ie9" lang="is" xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="https://www.facebook.com/2008/fbml" xml:lang="is" lang="is"> <![endif]--> <!--[if gt IE 8]><!--> <html class="no-js lang-is" xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="https://www.facebook.com/2008/fbml" xml:lang="is" lang="is"> <!--<![endif]--> <head> <title>Vísindavefurinn</title> <meta name="description" content="Notendur senda spurningar, vísindamenn svara. Hefur þig ekki alltaf langað að vita hvers vegna himinninn ER blár?" /> <meta name="keywords" content="Vísindavefurinn, visindavefurinn.is"> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=yes,minimum-scalable=1.0" /> <meta name="google-site-verification" content="UeM_PYJ3NMU1SICgJbjpZdSnqgd7GyGP5YNeM7CYey0" /> <meta name="google-site-verification" content="W8zhu2vlmP8cDcSp9nCc3F-GKMvtWGBQqOb4cZ-DFhU" /> <meta property="og:image" content="https://www.visindavefur.is/myndir/visindavefur_logo_stort_200514.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/thjodveldisbaerinn_060325.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/gragas_060325.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/visir_kuldi_litil_100418.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/hafis1a_litil_130418.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/skip_og_is_litil_130418.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/hafis2_litil_130418.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/isbjorn_litil_130418.jpg"/> <meta property="og:image" content="https://www.visindavefur.is/myndir/island_litil_110518.jpg"/> <meta property="fb:admins" content="723301661"/> <meta property="og:type" content="website"/> <meta property="og:url" content="http://www.visindavefur.is/"/> <meta property="og:title" content="Á Vísindavefnum svara fræðimenn spurningum almennings á öllum sviðum vísinda og fræða."/> <meta property="og:site_name" content="Vísindavefurinn"/> <link rel="stylesheet" href="/design/vv_styles.css?748e8eaf222ddd121278b8de38c535185a1fe729"> <link rel="alternate" type="application/rss+xml" title="RSS fyrir Vísindavefinn" href="/visindavefur.rss" /> <link rel="search" type="application/opensearchdescription+xml" href="/libs/opensearch/vv_opensearch.xml?ad167904565014f9f5c11520774f4f8e9e6449e7" title="Leit á Vísindavefnum" /> <!--[if (lt IE 9) & (!IEMobile)]> <script src="/libs/js/selectivizr-min.js?3945292ff776a4f8c611df09f49a051b56c0102f"></script> <![endif]--> <!--[if lt IE 9]> <script src="/libs/js/html5.js?f232b9610b4fd1c3c097616ecf3a1bb6d1d089a9"></script> <![endif]--> <!-- Piwik --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//vefgreinir.hi.is/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', 122]); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s); })(); </script> <noscript><p><img src="//vefgreinir.hi.is/piwik.php?idsite=122" style="border:0;" alt="" /></p></noscript> <!-- End Piwik Code --> </head> <body class="b-frontpage"> <header class="header"> <div class="header-container"> <div class="header-logo"><a href="/"><img src="/design/i_vv/logo.svg?2024" alt="Vísindavefurinn"><span>Vísindavefurinn</span></a></div> <div class="header-mobile"> <nav class="mobile-nav" role="navigation"> <ul> <li class="categories"><a href="/vegna_thess.php?id="><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-list"><line x1="8" y1="6" x2="21" y2="6"></line><line x1="8" y1="12" x2="21" y2="12"></line><line x1="8" y1="18" x2="21" y2="18"></line><line x1="3" y1="6" x2="3.01" y2="6"></line><line x1="3" y1="12" x2="3.01" y2="12"></line><line x1="3" y1="18" x2="3.01" y2="18"></line></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-x"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg> <span>Flokkar</span></a></li> <li class="burger"><a href="/"> <span>Valmynd</span> <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-menu"><line x1="3" y1="12" x2="21" y2="12"></line><line x1="3" y1="6" x2="21" y2="6"></line><line x1="3" y1="18" x2="21" y2="18"></line></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-x"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg></a></li> <li class="lang"> <img src="/design/i_vv/lang.svg?2024" alt="English"> <a href="http://www.why.is/">EN</a> </li> </ul> </nav> </div> <nav class="category-nav" role="navigation"> <ul> <li class="cat-all"> <a href="/vegna_thess.php?id="> <img src="/design/i_vv/icon-category.svg" alt=""> <span>Allir flokkar</span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=3"> <img src="/design/i_vv/icon-diversity.svg" alt=""> <span style="color:#719500"> Félagsvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=11"> <img src="/design/i_vv/icon-spa.svg" alt=""> <span style="color:#0098AA"> Heilbrigðisvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=2"> <img src="/design/i_vv/icon-neurology.svg" alt=""> <span style="color:#c0a14b"> Hugvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=152"> <img src="/design/i_vv/icon-school.svg" alt=""> <span style="color:#AC1A2F"> Menntavísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=1"> <img src="/design/i_vv/icon-genetics.svg" alt=""> <span style="color:#EB7125"> Náttúruvísindi og verkfræði </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=43"> <img src="/design/i_vv/icon-neurology.svg" alt=""> <span style="color:#00457C"> Vísindavefur </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=202"> <img src="/design/i_vv/icon-account-balance.svg" alt=""> <span style="color:#00457C"> Þverfræðilegt efni </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> </ul> </nav> <div class="header-desktop"> <nav class="desktop-nav" role="navigation"> <ul> <li><a href="/svar.php?id=73555">Tölfræði</a></li> <li><a href="/svar.php?id=70789">Um vefinn</a></li> <li><a href="/svar.php?id=70790">Þjónusta</a></li> <li class="search"> <form class="searchbar" action="/search/" method="GET"> <input type="search" name="q" class="d-search" placeholder="Sláðu inn leitarorð og ýttu á „enter“" /> <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none"> <mask id="mask0_853_7542" style="mask-type:alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="24" height="24"> <rect width="24" height="24" fill="#D9D9D9"/> </mask> <g mask="url(#mask0_853_7542)"> <path d="M19.6 21L13.3 14.7C12.8 15.1 12.225 15.4167 11.575 15.65C10.925 15.8833 10.2333 16 9.5 16C7.68333 16 6.146 15.371 4.888 14.113C3.62933 12.8543 3 11.3167 3 9.5C3 7.68333 3.62933 6.14567 4.888 4.887C6.146 3.629 7.68333 3 9.5 3C11.3167 3 12.8543 3.629 14.113 4.887C15.371 6.14567 16 7.68333 16 9.5C16 10.2333 15.8833 10.925 15.65 11.575C15.4167 12.225 15.1 12.8 14.7 13.3L21 19.6L19.6 21ZM9.5 14C10.75 14 11.8127 13.5627 12.688 12.688C13.5627 11.8127 14 10.75 14 9.5C14 8.25 13.5627 7.18733 12.688 6.312C11.8127 5.43733 10.75 5 9.5 5C8.25 5 7.18733 5.43733 6.312 6.312C5.43733 7.18733 5 8.25 5 9.5C5 10.75 5.43733 11.8127 6.312 12.688C7.18733 13.5627 8.25 14 9.5 14Z" fill="#4E4E4E"/> </g> </svg> </form> </li> <li class="lang"><img src="/design/i_vv/lang.svg?2024" alt="English"><a href="http://www.why.is/">EN</a></li> </ul> <a href="/search/" class="search-button btn btn-light"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-search"><circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line></svg></a> <div class="header-question"> <a href="/hvers_vegna.php?id=" onclick="javascript:$('a.send-question').click(); return false;" class="btn send">Senda inn spurningu <img src="/design/i_vv/message.svg" alt="message icon"></a> </div> </nav> <div class="header-data"> <div class="data-item"> <img src="/design/i_vv/icon-sun.svg" alt="Sólin"> Sólin <strong>Rís 07:52 • sest 19:24</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-moon.svg" alt="Tunglið"> Tunglið <strong>Rís 18:30 • Sest 08:08</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-flood.svg" alt="Flóð"> Flóð <strong>Árdegis: 06:11 • Síðdegis: 18:31</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-tide.svg" alt="Fjaran"> Fjara <strong>Árdegis: 00:03 • Síðdegis: 12:27</strong> <span>í Reykjavík</span> </div> </div> </div> </div> <div class="header-data"> <div class="data-item"> <img src="/design/i_vv/icon-sun.svg" alt="Sólin"> Sólin <strong>Rís 07:52 • sest 19:24</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-moon.svg" alt="Tunglið"> Tunglið <strong>Rís 18:30 • Sest 08:08</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-flood.svg" alt="Flóð"> Flóð <strong>Árdegis: 06:11 • Síðdegis: 18:31</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-tide.svg" alt="Fjaran"> Fjara <strong>Árdegis: 00:03 • Síðdegis: 12:27</strong> <span>í Reykjavík</span> </div> </div> </header> <div class="poppin md-send"> <a class="instructions" href="#">Leiðbeiningar<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-help-circle"><circle cx="12" cy="12" r="10"></circle><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path><line x1="12" y1="17" x2="12.01" y2="17"></line></svg></a><a class="instructions-close" href="#">Til baka <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-arrow-left"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></svg></a> <h2>Sendu inn spurningu </h2> <div class="instructions-more"> <p class="first">Hér getur þú sent okkur nýjar spurningar um vísindaleg efni.</p> <p>Hafðu spurninguna stutta og hnitmiðaða og sendu aðeins eina í einu. Einlægar og vandaðar spurningar um mikilvæg efni eru líklegastar til að kalla fram vönduð og greið svör. Ekki er víst að tími vinnist til að svara öllum spurningum.</p> <p>Persónulegar upplýsingar um spyrjendur eru eingöngu notaðar í starfsemi vefsins, til dæmis til að svör verði við hæfi spyrjenda. Spurningum er ekki sinnt ef spyrjandi villir á sér heimildir eða segir ekki nægileg deili á sér.</p> <p>Spurningum sem eru ekki á verksviði vefsins er eytt.</p> <p>Að öðru leyti er hægt að spyrja Vísindavefinn um allt milli himins og jarðar!</p> <div class="content-left-sep"></div> </div> <form action="/hvers_vegna.php?id=" method="POST" name="question_send"> <div class="md-fields"> <input type="hidden" name="step" value="4"> <div class="md-input"> <label for="s-fname">Nafn</label> <input type="text" name="f_name" class="send-input" id="s-fname" required="required" value=""> <input type="hidden" name="l_name" class="send-input" id="s-sname" value=""> </div> <div class="md-input"> <label for="s-email">Netfang</label> <input type="email" name="email" class="send-input" id="s-email" required="required" value=""> </div> <div class="md-input"> <label for="s-byear">Fæðingarár</label> <input type="number" name="birthyear" class="send-input" id="s-byear" maxlength="4" required="required" value=""> </div> <div class="md-input"> <label for="s-math">Ruslpóstvörn</label> <input type="hidden" name="vv_math_problem_hash_id" class="vv_math_problem_hash_id" id="vv_math_problem_hash_id" value=""> <input type="text" name="vv_math_problem_answer" id="vv_math_problem_answer" class="send-input" valuesize="2" maxlength="2" required="required" style="width: 30%;"> <span class="s-math-container"> = <span class="math_problem_num1_txt"></span> <img class="math_problem_math_icon" src="" /> <span class="math_problem_num2_txt"></span> </span> </div> <div class="md-input"> <label for="s-question">Spurning</label> <textarea type="text" name="question" class="send-input i-question" id="s-question" rows="6" required="required"></textarea> </div> </div> <div class="md-actions"> <button type="button" value="" class="btn btn-white"><i data-feather="x"></i> Hætta við</button> <button type="submit" value="Senda" class="btn send-button"><i data-feather="check"></i> Senda</button> </div> </form> </div> <section class="layout"> <div class="main-content"> <section class="layout-item"> <div class="article-wrapper"> <article class="default-article"> <div class="article-header"> <h1> <a href="/svar.php?id=87643" > Hefur íslenskt samfélag einhvern tíma verið stéttlaust? </a> </h1> </div> <div class="article-meta"> <div class="publish-date" style="display: block;"> <h4>Útgáfudagur:</h4> <p>13.03.2025</p> </div> <div class="publisher" style="display: none;"> <h4>Spyrjandi:</h4> <p>Linda Björg</p> </div> <div class="author"> <h4>Höfundur:</h4> <p>Axel Kristinsson</p> </div> </div> <div class="article-text"> <p> Svarið við spurningunni veltur á tvennu. Annars vegar því hvaða skilning við leggjum í orðið stéttleysi og þar með stéttskiptingu og hins vegar því hver raunveruleikinn var á ýmsum tímabilum Íslandssögunnar. Um hríð hefur sú hugmynd verið nokkuð útbr ... </p> <a href="/svar.php?id=87643" class="btn btn-brand">Sjá nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <g id="Icon"> <path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"/> </g> </svg> </a> </div> </article> <div class="article-hero"> <a href="/svar.php?id=87643"> <img src="/myndir/thumbs/jonsbok_mykjuklafur_070325_thumb_600w.jpeg" alt="Hefur íslenskt samfélag einhvern tíma verið stéttlaust?" /> </a> </div> </div> </section> <!-- ads begin --> <section class="layout-item"> <div class="sp-top-img" style="text-align: center;" > <a href="http://www.hhi.is" target="_blank"><img src="/auglysingar/hhi_visindavefur_2025.gif" alt="HHÍ - febrúar 2025 auglýsing" /></a> </div> </section> <!-- ads end --> <section class="backdrop-blue"> <div class="recent-answers layout-item"> <h2 class="section-title">Nýjustu svörin</h2> <a class="arrow-btn" href="/vegna_thess.php?id=138">Skoða öll nýjustu svörin <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-arrow-right"><line x1="5" y1="12" x2="19" y2="12"></line><polyline points="12 5 19 12 12 19"></polyline></svg></a></h2> <div class="recent-answers-wrapper"> <article class="recent-article"> <a href="/svar.php?id=87598" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Stærðfræði </div> <h4>Er stærðfræði tungumál? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=86880" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Málvísindi: íslensk </div> <h4>Hvað merkir orðið „blá“ í samhenginu „mýrar og blár“ og „engjar og blár“?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=87603" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Lífvísindi: almennt </div> <h4>Hvað eru til mörg kyn í náttúrunni?</h4> </a> </article> </div> </div> </section> <section class="layout-item"> <div class="science-calendar"> <h2 class="section-title">Vísindadagatal 13. mars</h2> <div class=""> <a href="/svar.php?id=58666" class="science-calendar-wrapper" id="science-calendar-story" > <div class="science-item-hero"> <img src="/myndir/sciday_humboldt.jpg" alt="Alexander von Humboldt"> </div> <div class="science-item-content"> <p class="section-title">Vísindasagan</p> <h1>Alexander von Humboldt</h1> <h2>1769-1859</h2> <p>Þýskur náttúrufræðingur og landkönnuður, brautryðjandi í kerfisbundnum rannsóknum á útbreiðslu jurta, m.a. í Suður-Ameríku.</p> <div class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg> </div> </div> </a> <a href="/svar.php?id=1656" class="science-calendar-wrapper" id="science-calendar-informed" > <div class="science-item-hero"> <img src="/myndir/sciday_2016_72.jpg" alt=" Eldur"> </div> <div class="science-item-content"> <p class="section-title">Dagatal hinna upplýstu</p> <h1> Eldur</h1> <h2></h2> <p>Mannkynið hefur þekkt eldinn frá örófi alda. Það kynntist honum m.a. í skógareldum, eldingum og eldgosum. Fyrir um 350.000 árum var maðurinn farinn að nota eld í Afríku, Asíu og í Evrópu. Eldurinn gerði mönnum kleift að setjast að á norðlægum slóðum og háfjallasvæðum. Með eldun á mat dró úr líkum á sýkingum og hægt var að nýta fæðutegundir sem annars væru lítt meltanlegar eða ómeltanlegar.</p> <div class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg> </div> </div> </a> <a href="/svar.php?id=75464" class="science-calendar-wrapper" id="science-calendar-icelandic" > <div class="science-item-hero"> <img src="/myndir/svanhildur_oskarsdottir_dagatal_smamynd_120318.png" alt="Svanhildur Óskarsdóttir"> </div> <div class="science-item-content"> <p class="section-title">Íslenskir vísindamenn</p> <h1>Svanhildur Óskarsdóttir</h1> <h2>1964</h2> <p>Svanhildur Óskarsdóttir er handritafræðingur á Stofnun Árna Magnússonar í íslenskum fræðum. Rannsóknir hennar snúast um þann margvíslega vitnisburð sem handrit veita okkur um íslenska menningar- og bókmenntasögu fyrri alda.</p> <div class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg> </div> </div> </a> </div> </div> </section> <section class="backdrop-blue"> <div class="recent-answers tab-answers layout-item"> <!-- Vinsæl svör --> <h2 class="section-title">Vinsæl svör <div class="tab-nav"> <a href="#vinsaelsvor-day" class="--active" > Í dag </a> <a href="#vinsaelsvor-week" > Í vikunni <!-- Hidden for now </a> <a href="#vinsaelsvor-month" > Í mánuðnum </a> <a href="#vinsaelsvor-year" > Á árinu --> </a> </div> </h2> <div class="tabs"> <div class="recent-answers-wrapper tab --active" id="vinsaelsvor-day"> <article class="recent-article"> <a href="/svar.php?id=84708" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar eru ástæður stríðsins í Úkraínu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=22451" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar voru helstu ástæðurnar fyrir hruni Sovétríkjanna?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=4614" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hver er eðlilegur blóðþrýstingur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5537" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Tölvunarfræði </div> <h4>Íslenskar gæsalappir eru „svona“, en hvar finn ég '„' á íslenska lyklaborðinu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=83660" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Jarðvísindi </div> <h4>Hvaða stórgos varð á jörðinni árið 536 og er vitað hvaða afleiðingar það hafði?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5079" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #00457C" > Unga fólkið svarar </div> <h4>Hvenær verður næsti tunglmyrkvi á Íslandi?</h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="vinsaelsvor-week"> <article class="recent-article"> <a href="/svar.php?id=84708" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar eru ástæður stríðsins í Úkraínu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=22451" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar voru helstu ástæðurnar fyrir hruni Sovétríkjanna?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=4614" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hver er eðlilegur blóðþrýstingur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5537" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Tölvunarfræði </div> <h4>Íslenskar gæsalappir eru „svona“, en hvar finn ég '„' á íslenska lyklaborðinu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=58979" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er skoðað í almennri blóðrannsókn?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5079" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #00457C" > Unga fólkið svarar </div> <h4>Hvenær verður næsti tunglmyrkvi á Íslandi?</h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="vinsaelsvor-month"> <article class="recent-article"> <a href="/svar.php?id=84708" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar eru ástæður stríðsins í Úkraínu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=22451" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar voru helstu ástæðurnar fyrir hruni Sovétríkjanna?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=4614" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hver er eðlilegur blóðþrýstingur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5537" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Tölvunarfræði </div> <h4>Íslenskar gæsalappir eru „svona“, en hvar finn ég '„' á íslenska lyklaborðinu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=3201" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: Íslandssaga </div> <h4>Af hverju er öskudagur haldinn hátíðlegur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=3972" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hvað er kreatín?</h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="vinsaelsvor-year"> <article class="recent-article"> <a href="/svar.php?id=4614" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hver er eðlilegur blóðþrýstingur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5537" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Tölvunarfræði </div> <h4>Íslenskar gæsalappir eru „svona“, en hvar finn ég '„' á íslenska lyklaborðinu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=3972" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hvað er kreatín?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=58979" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er skoðað í almennri blóðrannsókn?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=54809" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hvað er lágþrýstingur?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=22451" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Sagnfræði: mannkynssaga </div> <h4>Hverjar voru helstu ástæðurnar fyrir hruni Sovétríkjanna?</h4> </a> </article> </div> </div> </div> <!--- Önnur svör --> <div class="recent-answers tab-answers layout-item"> <h2 class="section-title">Önnur svör <div class="tab-nav"> <a href="#onnursvor-day" class="--active" > Í dag </a> <a href="#onnursvor-week" > Í vikunni <!-- Hidden for now </a> <a href="#onnursvor-month" > Í mánuðnum </a> <a href="#onnursvor-year" > Á árinu --> </a> </div> </h2> <div class="tabs"> <div class="recent-answers-wrapper tab --active" id="onnursvor-day"> <article class="recent-article"> <a href="/svar.php?id=1609" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er vatnshöfuð og hverjar eru afleiðingar þess?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=1245" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvaða hlutverk hefur gallblaðran og hvaða áhrif hefur það á líkamann ef hún er tekin?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=1093" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er hantaveira?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=961" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Landafræði </div> <h4>Hvað eru heimsálfurnar margar? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=874" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er vitað um munnangur og er til lækning við því?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=526" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Til hvers er botnlanginn?</h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="onnursvor-week"> <article class="recent-article"> <a href="/svar.php?id=5723" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Lífvísindi: mannslíkaminn </div> <h4>Hvað er sveppasýking?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=3614" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Landafræði </div> <h4>Hvaða lönd teljast til Evrópu?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=1022" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #719500" > Hagfræði </div> <h4>Hvernig er markaðsvirði fyrirtækis reiknað út?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=65699" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Jarðvísindi </div> <h4>Hvað getið þið sagt mér um eldvirkni á Reykjanesskaga?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=6476" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Bókmenntir og listir </div> <h4>Hvað þarf að vera í sögu til þess að hún sé talin til Íslendingasagna?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=6155" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Málvísindi: íslensk </div> <h4>Hvaða regla gildir um það hvort fólk er statt í eða á landi (á Íslandi, í Þýskalandi)? </h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="onnursvor-month"> <article class="recent-article"> <a href="/svar.php?id=241" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Lífvísindi: almennt </div> <h4>Hver er munurinn á bakteríu og veiru? Eru sýklar og bakteríur það sama?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=65457" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hver eru einkenni heilahimnubólgu og hvað er bráðaheilahimnubólga?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=54537" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er ennisholubólga og er hún læknanleg? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=5102" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #00457C" > Unga fólkið svarar </div> <h4>Hvað eru mörg grömm af prótínum í einu meðalhænueggi?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=961" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Landafræði </div> <h4>Hvað eru heimsálfurnar margar? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=68511" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Landafræði </div> <h4>Hvaða lönd í Evrópu voru hluti af Sovétríkjunum fyrir 1991?</h4> </a> </article> </div> <div class="recent-answers-wrapper tab " id="onnursvor-year"> <article class="recent-article"> <a href="/svar.php?id=12422" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Lífvísindi: almennt </div> <h4>Hvað er E. coli? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=2700" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er MÓSA-smit? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=19829" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Hvað er tennisolnbogi og af hverju stafar hann? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=71480" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #EB7125" > Efnafræði </div> <h4>Hvað er gull og hvers vegna fellur ekkert á það?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=52700" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Af hverju fær maður sinaskeiðabólgu og hvernig er hægt að losna við hana?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=739" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Málvísindi: íslensk </div> <h4>Hvort á að skrifa fyrirfram eða fyrir fram?</h4> </a> </article> </div> </div> </div> </section> <section class="layout-item"> <div class="science-news"> <h2 class="section-title">Vísindafréttir</h2> <div class="science-news-wrapper"> <h1> <a href="/svar.php?id=87348"> Hvaða svör voru mest lesin á Vísindavefnum árið 2024? </a> </h1> <p>Svör um fjölda og stærð eldgosa á Reykjanesskaga, starfsstjórn, uppgreiðslu lána, og um það hvort svonefndir Tyrkjaránsmenn hafi eignast börn með íslenskum konum, voru mest lesnu nýju svör ársins 2024 á Vísindavefnum. Fimm mest lesnu nýju svör árs... </p> <a href="/svar.php?id=87348" class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg></a> </div> <a class="arrow-btn" href="/vegna_thess.php?id=223">Sjá vísindafréttir <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-arrow-right"><line x1="5" y1="12" x2="19" y2="12"></line><polyline points="12 5 19 12 12 19"></polyline></svg> </a> </div> </section> </div> </section> <footer> <section> <div class="footer-container"> <div class="footer-left-right"> <div class="footer-left"> <a href="/"><div class="logo-bottom"></div></a> </div> <div class="footer-center contact-info"> <!-- address box begins --> <ul class="contact-list"> <!-- address box begins --> <li><img src="/design/i_vv/icon-location.svg" alt="">Dunhaga 5, 107 Reykjavík</li> <li><img src="/design/i_vv/icon-telephone.svg" alt=""><a href="tel:+3545254765">525-4765</a></li> <li class="f-email"><img src="/design/i_vv/icon-email.svg" alt=""><a href="mailto:visindavefur@hi.is">Tölvupóstur <span class="extra">til ritstjórnar</span></a></li> <!-- address box ends --> </ul> <!-- address box ends --> </div> <div class="footer-right"> <a href="#" class="arrow-btn scroll-up">Skruna upp<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none"><mask id="mask0_798_1658" style="mask-type:alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="24" height="24"><rect width="24" height="24" fill="#D9D9D9"/></mask><g mask="url(#mask0_798_1658)"><path d="M11 20V7.825L5.4 13.425L4 12L12 4L20 12L18.6 13.425L13 7.825V20H11Z" fill="#10099F"/></g></svg></a> </div> </div> </div> </section> </footer> <div class="poppin poppin--alert --hide" id="cookie-policy-disclaimer"> <p>Þessi síða notar vafrakökur <a href="/svar.php?id=76210">Nánari upplýsingar</a></p> <a href="#" class="btn" onclick="javascript:vv_public_cookie_policy_ok();">Ég samþykki <i data-feather="check-circle"></i></a> </div> <!--<script src="/libs/js/fb-js-sdk2.js" async="" crossorigin="anonymous"></script>--> <!--<script id="facebook-jssdk" src="/libs/js/fb-js-sdk.js">--> <script type="text/javascript" src="/libs/js/jquery-2.2.4.min.js?c6ab43d6596db5a7d10faf2338aea3f6cb734ac7"></script> <script type="text/javascript" src="/libs/js/jquery.cookie.js?8c4cbb4a39b126679aeb4dcd82817c380b8a2041"></script> <script type="text/javascript" src="/libs/js/jquery.waypoints.js?d4073724d7a9642ad4081c2d83e247f94261cc56"></script> <script type="text/javascript" src="/libs/js/feather.js?f95a28afade14d2a05d9dbcb9d05bc5315a71ed4"></script> <script type="text/javascript" src="/libs/js/mainweb-is.js?266919373c4ea4d8510d35411c8281aa49dbb167"></script> <script src="//cdn1.readspeaker.com/script/10303/webReader/webReader.js?pids=wr" type="text/javascript"></script> <div id="fb-root"></div> <script>(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/en_US/all.js#xfbml=1"; fjs.parentNode.insertBefore(js, fjs); }(document, 'script', 'facebook-jssdk'));</script> </body> </html>