Why are yawns contagious?!

Question: Why are yawns contagious?
Answers:

Best Answer - Chosen by Voters

you just made me yawn

Yawning when others yawn, the study suggests,
is a sign of empathy and a form of social bonding.

http://news.discovery.com/human/yawning-…

http://ask.yahoo.com/ask/20050623.html

Because they carry the HIV.

Al Qaeda

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Why are yawns contagious?!

Best Answer - Chosen by Voters

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