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.
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