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Please try again later. </div> </div> <button class="yt-uix-button yt-uix-button-size-default yt-uix-button-default yt-uix-button-empty yt-uix-button-has-icon no-icon-markup yt-uix-button-opacity yt-uix-close" type="button" onclick=";return false;" aria-label="Close" id="action-panel-dismiss" data-close-parent-id="watch8-action-panels"></button> </div> <div id="promotion-shelf" class="promotion-shelf-slot yt-card yt-card-has-padding hid"></div> <div id="action-panel-details" class="action-panel-content yt-uix-expander yt-card yt-card-has-padding yt-uix-expander-collapsed"><div id="watch-description" class="yt-uix-button-panel"><div id="watch-description-content"><div id="watch-description-clip"><div id="watch-uploader-info"><strong class="watch-time-text">Published on Aug 14, 2013</strong></div><div id="watch-description-text" class=""><p id="eow-description" class="">Russell Foster is a circadian neuroscientist: He studies the sleep cycles of the brain. And he asks: What do we know about sleep? Not a lot, it turns out, for something we do with one-third of our lives. In this talk, Foster shares three popular theories about why we sleep, busts some myths about how much sleep we need at different ages -- and hints at some bold new uses of sleep as a predictor of mental health.<br/><br/>TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). 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Jordan Peterson" data-visibility-tracking="CCQQpDAYCiITCNLLrcCL3OACFdmvxAodamsFHij4HUDwuaTKsN_Vl50B"> <span dir="ltr" class="title" aria-describedby="description-id-601033"> How To Avoid Embarrassing Yourself In An Argument - Jordan Peterson </span> <span class="accessible-description" id="description-id-601033"> - Duration: 11:45. </span> <span class="stat attribution"><span class="">Charisma on Command</span></span> <span class="stat view-count">5,990,111 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=nS9W-wlJHPA" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCQQpDAYCiITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CCQQpDAYCiITCNLLrcCL3OACFdmvxAodamsFHij4HUDwuaTKsN_Vl50B" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="nS9W-wlJHPA"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/nS9W-wlJHPA/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLBjCM7Y8zZo1N672HZVCsmS_l8k-Q" width="168"><span class="video-time">11:45</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=C4Uc-cztsJo" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCMQpDAYCyITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="More adventures in replying to spam | James Veitch" data-visibility-tracking="CCMQpDAYCyITCNLLrcCL3OACFdmvxAodamsFHij4HUCa4bbnnJ_Hwgs="> <span dir="ltr" class="title" aria-describedby="description-id-596473"> More adventures in replying to spam | James Veitch </span> <span class="accessible-description" id="description-id-596473"> - Duration: 10:21. </span> <span class="stat attribution"><span class="">TED Archive</span></span> <span class="stat view-count">20,489,683 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=C4Uc-cztsJo" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCMQpDAYCyITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CCMQpDAYCyITCNLLrcCL3OACFdmvxAodamsFHij4HUCa4bbnnJ_Hwgs=" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="C4Uc-cztsJo"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/C4Uc-cztsJo/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLC-k3CS96Ntwo5fiYcmDXweZBGdmg" width="168"><span class="video-time">10:21</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=Dar8P3r7GYA" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCIQpDAYDCITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="SpaceX's plan to fly you across the globe in 30 minutes | Gwynne Shotwell" data-visibility-tracking="CCIQpDAYDCITCNLLrcCL3OACFdmvxAodamsFHij4HUCAs-zX94e_1Q0="> <span dir="ltr" class="title" aria-describedby="description-id-840746"> SpaceX's plan to fly you across the globe in 30 minutes | Gwynne Shotwell </span> <span class="accessible-description" id="description-id-840746"> - Duration: 21:31. </span> <span class="stat attribution"><span class="">TED</span></span> <span class="stat view-count">753,424 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=Dar8P3r7GYA" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCIQpDAYDCITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CCIQpDAYDCITCNLLrcCL3OACFdmvxAodamsFHij4HUCAs-zX94e_1Q0=" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="Dar8P3r7GYA"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/Dar8P3r7GYA/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLCBHsWeb5cw_BXJ4cf3ZKPzwJGP5A" width="168"><span class="video-time">21:31</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=pni_kDv9BsU" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCEQpDAYDSITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="Former CIA Officer Will Teach You How to Spot a Lie l Digiday" data-visibility-tracking="CCEQpDAYDSITCNLLrcCL3OACFdmvxAodamsFHij4HUDFjfTfg_KvvKYB"> <span dir="ltr" class="title" aria-describedby="description-id-317915"> Former CIA Officer Will Teach You How to Spot a Lie l Digiday </span> <span class="accessible-description" id="description-id-317915"> - Duration: 47:47. </span> <span class="stat attribution"><span class="">Digiday</span></span> <span class="stat view-count">5,608,237 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=pni_kDv9BsU" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCEQpDAYDSITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CCEQpDAYDSITCNLLrcCL3OACFdmvxAodamsFHij4HUDFjfTfg_KvvKYB" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="pni_kDv9BsU"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/pni_kDv9BsU/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLCogMQkTsaAVdoqMR22C8pFedgGwA" width="168"><span class="video-time">47:47</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=gypAjPp6eps" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCAQpDAYDiITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="The most mysterious star in the universe | Tabetha Boyajian" data-visibility-tracking="CCAQpDAYDiITCNLLrcCL3OACFdmvxAodamsFHij4HUCb9enTz5GQlYMB"> <span dir="ltr" class="title" aria-describedby="description-id-579437"> The most mysterious star in the universe | Tabetha Boyajian </span> <span class="accessible-description" id="description-id-579437"> - Duration: 13:47. </span> <span class="stat attribution"><span class="">TED</span></span> <span class="stat view-count">3,574,287 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=gypAjPp6eps" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CCAQpDAYDiITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CCAQpDAYDiITCNLLrcCL3OACFdmvxAodamsFHij4HUCb9enTz5GQlYMB" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="gypAjPp6eps"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/gypAjPp6eps/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLBe9rHEFEjJ32FUT1S3T9lZXq2YMQ" width="168"><span class="video-time">13:47</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=qYvXk_bqlBk" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB8QpDAYDyITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="Who are you, really? The puzzle of personality | Brian Little" data-visibility-tracking="CB8QpDAYDyITCNLLrcCL3OACFdmvxAodamsFHij4HUCZqKq3v_L1xakB"> <span dir="ltr" class="title" aria-describedby="description-id-837194"> Who are you, really? The puzzle of personality | Brian Little </span> <span class="accessible-description" id="description-id-837194"> - Duration: 15:16. </span> <span class="stat attribution"><span class="">TED</span></span> <span class="stat view-count">3,721,784 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=qYvXk_bqlBk" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB8QpDAYDyITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CB8QpDAYDyITCNLLrcCL3OACFdmvxAodamsFHij4HUCZqKq3v_L1xakB" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="qYvXk_bqlBk"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/qYvXk_bqlBk/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLDR9GPyzpmaUszu2Xg2jfcR5WKz6w" width="168"><span class="video-time">15:16</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=1TerTgDEgUE" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB4QpDAYECITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="Banned TED Talk: The Science Delusion - Rupert Sheldrake at TEDx Whitechapel" data-visibility-tracking="CB4QpDAYECITCNLLrcCL3OACFdmvxAodamsFHij4HUDBgpKG4Onqm9UB"> <span dir="ltr" class="title" aria-describedby="description-id-503564"> Banned TED Talk: The Science Delusion - Rupert Sheldrake at TEDx Whitechapel </span> <span class="accessible-description" id="description-id-503564"> - Duration: 18:20. </span> <span class="stat attribution"><span class="">Tom Huston</span></span> <span class="stat view-count">2,950,048 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=1TerTgDEgUE" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB4QpDAYECITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CB4QpDAYECITCNLLrcCL3OACFdmvxAodamsFHij4HUDBgpKG4Onqm9UB" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="1TerTgDEgUE"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" data-thumb="https://web.archive.org/web/20190227140915/https://i.ytimg.com/vi/1TerTgDEgUE/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLCrFUC86l8ihSOk7p--3MwyCRv8pg" width="168"><span class="video-time">18:20</span></span></a> </div> </li><li class="video-list-item related-list-item show-video-time related-list-item-compact-video"> <div class="content-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=MnT1xgZgkpk" class=" content-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB0QpDAYESITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" title="What happens when our computers get smarter than we are? | Nick Bostrom" data-visibility-tracking="CB0QpDAYESITCNLLrcCL3OACFdmvxAodamsFHij4HUCZpYKz4Li9ujI="> <span dir="ltr" class="title" aria-describedby="description-id-172609"> What happens when our computers get smarter than we are? | Nick Bostrom </span> <span class="accessible-description" id="description-id-172609"> - Duration: 16:32. </span> <span class="stat attribution"><span class="">TED</span></span> <span class="stat view-count">1,555,741 views</span> </a> </div> <div class="thumb-wrapper"> <a href="/web/20190227140915/https://www.youtube.com/watch?v=MnT1xgZgkpk" class=" vve-check thumb-link spf-link yt-uix-sessionlink spf-link " data-sessionlink="itct=CB0QpDAYESITCNLLrcCL3OACFdmvxAodamsFHij4HTIHcmVsYXRlZEiXxaKB_eDCsi0" rel=" spf-prefetch nofollow" tabindex="-1" data-visibility-tracking="CB0QpDAYESITCNLLrcCL3OACFdmvxAodamsFHij4HUCZpYKz4Li9ujI=" aria-hidden="true"><span class="yt-uix-simple-thumb-wrap yt-uix-simple-thumb-related" data-vid="MnT1xgZgkpk"><img src="/web/20190227140915im_/https://www.youtube.com/yts/img/pixel-vfl3z5WfW.gif" height="94" alt="" style="top: 0px" aria-hidden="true" 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