0 Question: Why do we yawn? Keywords: human behaviour, yawn Asked by 349anta39 to Rob, Ceri on 18 Nov 2014.
Ceri Dare answered on 18 Nov 2014:
Nobody knows for sure!
Robert Hampson answered on 19 Nov 2014:
There is very little consensus as to why we yawn. However, it is known to be contagious.
There is a lot of interesting discussion on wikipedia. http://en.wikipedia.org/wiki/Yawn
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