The Theories On Why Yawns Are So Contagious [VIDEO]
2013.11.09
![yawn1.jpg yawn1.jpg](/files/attach/images/1097/057/922/008/yawn1.jpg)
Even reading the word YAWN, makes you want to yawn. But why is it so? Why does someone else's yawn make you want to yawn?
This video from TED-ed offers a couple of theories. Check it out:
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