document.write('<style type=\"text\/css\">\n.can_ad_slug {font-family:arial;font-size:11px;color:#999;text-decoration:none;background-image:url(\'https:\/\/s.yimg.com\/ch\/icons\/adchoices\/adchoicesblue.png\');background-repeat:no-repeat;background-position:right;padding:0px 16px 0px 1px !important;margin:1px 0px 1px 0;cursor:hand;height:12px;display:inline-block;line-height:12px;background-color:#ffffff;}\n.ad_slug_table {position: relative;}\n.ad_slug_table a {text-decoration:none;}\n.ad_slug_table div.CAN_marker { display:none;}\n.can_ad_slug span {display:none;}\n.can_ad_slug:hover {zoom: 1;}\n.ad_slug_table .ad_slug_table .can_ad_tr td {display: none;}\n.can_ad_slug:hover span {display:inline-block;color:#999;font-family:arial;font-size:11px;}\n.can_ad_tr {position:absolute;top:0;right:1px;z-index:999;}\n<\/style>\n<div class=\"CAN_ad\">\n<table class=\"ad_slug_table\" cellspacing=\"0\" cellpadding=\"0\" border=\"0\">\n<tr class=\"can_ad_tr\"><td align=\"right\"><a href=\"http:\/\/info.yahoo.com\/privacy\/us\/yahoo\/relevantads.html\" class=\"CAN_link can_ad_slug\" target=\"_blank\"><span>AdChoices<\/span><\/a><\/td><\/tr>\n<tr><td><a href=\"https:\/\/pr.ybp.yahoo.com\/cj\/cd\/t2lwoC5mn9txRAh6TcgEQ6jYkgCsPQUWt8gskxf9gEoXhMMdK1McbOAcLsVRdfoi3ZmmEgOSNCYl038fjSkWk9iWaWJbAZ7z5eCiXcdEOjHUn7otohETNQ1_vDBxrGSobIJj1UU2St4oquftkdvGFFnLhPAFOpq4F4kjeKyT_j3Cu2-TDGOPV99VDRaPs9kq5wTB7scAEj9kGBDymmWek6eQ32zVKLQTmVzu1sO3hS23VkpOCURON2c8O-q27KYLSeDgcVz4FEBqGgYWNCRv43111gusYLWj\/rurl\/https:\/\/simplisafe.com\/dsp?utm_medium=cpc&utm_source=VerizonDSP&utm_campaign=display_openExchange&utm_term=britannica.com&utm_content=113&utm_device=Desktop&vmcid=p%24d%2Co%24768394972522253761%2Ct%241645738605638%2Ca%248625429\" target=\"_blank\"><img src=\"https:\/\/s.yimg.com\/ch\/8c1a6951-c2aa-4764-9004-75ff5a41722b.jpeg\" border=0 width=300 height=250 alt=\"advertisement\" \/><\/a><img src=\"https:\/\/d.agkn.com\/pixel\/7953\/?che=8542126473016020270&col=301939,113,1753289,0,3886252,,,britannica.com&adid=8625429\" \/><\/td><\/tr>\n<\/table>\n<\/div>');document.write('<scr' + 'ipt type="application/javascript">(function() {window.YAHOO = window.YAHOO || {};window.YAHOO.Viewability = window.YAHOO.Viewability || {};window.YAHOO.Viewability.Display = window.YAHOO.Viewability.Display || {};window.YAHOO.Viewability.Display.data = window.YAHOO.Viewability.Display.data || [];window.YAHOO.Viewability.Display.data.push({view_id: "x_vi_div-768394972522253761-1645738605638",beaconUrl: "https://beap-bc.yahoo.com/yv?sek=768394972522253761:1645738605638&as=YAMPViewableImpressionPayload&av=2.19.0&kv=0&ea=1&ap=DX0IHx6hbY-jt5sxOuIDSMEluv-njl2LctgJg2JuFWjQqn0tlw7qqTYKt6b0Q2mkpXIFXvnmeO2Tv7ORFjcioQcDk5t9UP4874P6GAxunECwDDHORgs33IEIrhbPOS_5CnLqm3hWjFawOIJOJntKBgg5R_xwDpP0E3tCa7IsVAloODo189WJipdr20x18cMruVeM-3ZByr2X9GGK-gYs_pdShx2c_jclHWSEK0tCevQ&iv=%InViewPercentage%&v=%Viewable%&m=%MeasurementType%&r=%Timestamp%",publisherID: "113"});})();</scr' + 'ipt>');document.write('<scr' + 'ipt id="x_vi_div-768394972522253761-1645738605638" src="https://cdn.js7k.com/rq/iv/inside-5.js"></scr' + 'ipt>');