Crosswords2 mins ago
why do we yawn?
5 Answers
What is a yawn, why do we do them? Why do we copy people doing them?
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For more on marking an answer as the "Best Answer", please visit our FAQ.was gonna say lack of oxygen but read this lol
http://en.wikipedia.org/wiki/Yawn
very interesting tho it might make you yawn
http://en.wikipedia.org/wiki/Yawn
very interesting tho it might make you yawn
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