1.0Resources » Surfnetkidshttps://www.surfnetkids.com/resourcesBarbara Feldmanhttp://www.surfnetkids.com/barbara/rich600338<blockquote class="wp-embedded-content" data-secret="s34OCLMTzQ"><a href="https://www.surfnetkids.com/resources/lightning/">Lightning</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.surfnetkids.com/resources/lightning/embed/#?secret=s34OCLMTzQ" width="600" height="338" title="“Lightning” — Resources » Surfnetkids" data-secret="s34OCLMTzQ" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://www.surfnetkids.com/resources/wp-includes/js/wp-embed.min.js /* ]]> */ </script> Surfnetkids recommends five lightning websites for families and classrooms. Although it has been studied since the eighteenth century, the mystery of what causes lightning has not been completely unlocked. Beautiful to behold, but