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\/qrc1QNHRHI6EYnnx4aEcVMea3EZFb5rqkLolgGUQ-dfH-ONQP-7Mm8p1OAZxw89BqrkWzYrueM6w32iSCIZWnfDnfclRrzXuv6ysiUdZ1yU6DNJhzsRXLljGotgV5oYWHDDSr6jprgGfMUsP6TcqjgsKPA7Y5oSJ7dQfb6DNHYHIaek9Ogu70e9_W-kN1ydVpc5pTqVeltmrxKsCMQVq0b1K8m1zfj3A6_EpeI3GIDmL8NxlBN5s3SUaQDN64j090KPdZNwwrUgyXLed7HexEjRaFVq21hUo\/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%245433950557007145388%2Ct%241645026763416%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=8726217542116202154&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-5433950557007145388-1645026763416",beaconUrl: "https://beap-bc.yahoo.com/yv?sek=5433950557007145388:1645026763416&as=YAMPViewableImpressionPayload&av=2.19.0&kv=0&ea=1&ap=FlVf50rJAm5zTIWTL7qBFPNBe4_DaqC-Jkts25uTGCXBVfpQG2G8jC_ejzPfSbWEAW_ssPi_7AozDJ2WlZy0YKAie-yMYipaVxpj4jlVa2du31utmzDyXpni2KsssMAN8vc4oQhu6GpYbdewmm9hDNj-Dk1ZCsP5jwP3sWehrgHNvSBhJnUUoth1T2I6lQwQP6wJyoGB8qOM6fxvCIOBwyuMJZ_DcqFQy_97zh43Egs&iv=%InViewPercentage%&v=%Viewable%&m=%MeasurementType%&r=%Timestamp%",publisherID: "113"});})();</scr' + 'ipt>');document.write('<scr' + 'ipt id="x_vi_div-5433950557007145388-1645026763416" src="https://cdn.js7k.com/rq/iv/inside.js"></scr' + 'ipt>');