Why Is Yawning Contagious?

Name: Why Is Yawning Contagious?
Uploaded: 2012-05-16T18:58:26+00:00
Description: LINKS TO LEARN MORE: http://www.twitter.com/Tweetsauce http://www.Facebook.com/VsauceGaming Vsauce SHIRTS: http://www.districtlines.com/vsauce Other...

Collected by videosift on May 16, 2012

LINKS TO LEARN MORE: http://www.twitter.com/Tweetsauce http://www.Facebook.com/VsauceGaming Vsauce SHIRTS: http://www.districtlines.com/vsauce Other...

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