Why Is Yawning Contagious?

Name: Why Is Yawning Contagious?
Uploaded: 2012-05-12T19:10:36.000Z
Duration: 5 min 45 s

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PostedMay 12, 2012Views4,779,899Duration05:45

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:…

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