{"page":"<link rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" />\n<link rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" />\n<div data-title='The Four 4s - Numberphile' data-url='/boclips/videos/5c670aa1350a1b0001a75d82' data-video-url='/boclips/videos/5c670aa1350a1b0001a75d82' id='bo_player_modal'>\n<div class='boclips-resource-page modal-dialog panel-container'>\n<div class='react-notifications-root'></div>\n<div class='rp-header'>\n<div class='rp-type'>\n<i aria-hidden='true' class='fai fa-regular fa-circle-play'></i>\nVideo\n</div>\n<h1 class='rp-title' id='video-title'>\nThe Four 4s - Numberphile\n</h1>\n<div class='rp-actions'>\n<div class='mr-1'>\n<a class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"><span><span>Get Free Access</span><span class=\"\"> for 10 Days</span><span>!</span></span></a>\n</div>\n</div>\n</div>\n<div class='rp-body'>\n<div class='rp-info'>\n<div aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'>&times;</div>\n<i aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'></i>\n<i aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'></i>\n<div class='rp-rating'>\n<span class='resource-pool'>\n<span class='pool-label'>Publisher:</span>\n<span class='pool-name'>\n<span class='text'><a data-publisher-id=\"30358509\" href=\"/search?publisher_ids%5B%5D=30358509&amp;search_tab_id=1\">Numberphile</a></span>\n</span>\n</span>\n</div>\n<div class='rp-description'>\n<span class='short-description'>It was a famous problem for many years - until a physics genius solved it all the way to infinity. Featuring author Alex Bellos - more links below. Extras from this interview More Numberphile videos with Alex Alex's recent book about...</span>\n<span class='full-description hide'>It was a famous problem for many years - until a physics genius solved it all the way to infinity. Featuring author Alex Bellos - more links below. Extras from this <a href='https://youtu.be/jv8dITbiheQ' target='_blank' rel='nofollow'>interview</a> More Numberphile videos with <a href='http://bit.ly/Bellos_Playlist' target='_blank' rel='nofollow'>Alex</a> Alex's recent book about puzzles (including the Four <a href='http://amzn.to/2jRo0n2' target='_blank' rel='nofollow'>4s)</a> More Alex <a href='http://bit.ly/BellosBooks' target='_blank' rel='nofollow'>books</a> With a sincere thanks to these Patrons... Jeff Straathof Today I Found Out Peggy You'll Christian Cooper Dr Jubal John James Bissonette Ken Baron Andrzej 'Yester' Fiedukowicz Bill Shillito Tony Fadell Erik Alexander Nordlund Thomas Buckingham Susan Silver OK Merli Tyler O'Connor Jon Padden Ciprian Stan Vali Dobrota D Hills Charles Southerland Arnas plusunim Paul Bates Jordan Smith Tracy Parry Kristian Joensen Tryggve Johannesson Alfred Wallace Join out Patreon supporters <a href='http://www.patreon.com/numberphile' target='_blank' rel='nofollow'>at</a> Numberphile is supported by the Mathematical Sciences Research Institute (<a href='http://bit.ly/MSRINumberphile' target='_blank' rel='nofollow'>MSRI)</a> We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. 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