Why Is Yawning Contagious?
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YouTubeVsauce
Why Is Yawning Contagious?
Why Do We Yawn? http://www.twitter.com/Tweetsauce Vsauce SHIRTS: http://www.districtlines.com/vsauce Other peeps in this video: Charlie: http://www.youtube.com/charlieissocoollike Alex: http://www.youtube.com/nerimon Yawning to cool down your brain: http://well.blogs.nytimes.com/2011/10/03/really-the-claim-yawning-cools-the-brain/ and: http ...
4.8M viewsMay 12, 2012
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