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Why is yawning contagious? I was on Skype the other day talking to my girlfriend, and we were still able to give each other the yawns. Weird.

Here are a couple of links that talks about the contagious nature of yawning.

http://www.world-science.net/exclusives/050309_yawnfrm.htm
http://news.discovery.com/human/yawning-social-behavior.html

REFERENCE: movie “Contagion

http://american-otaku.com/2011/10/contagious/