Why We Yawn (and Why They're Actually Contagious).b
https://www-newz.blogspot.com/2014/08/why-we-yawn-and-why-they-actually.html
Babies, dogs, cats, birds, mice, rats and even snakes yawn, and some of us were even doing it in the womb. Although for thousands of years the reason has remained elusive, recent scholarship may have uncovered the truth as to why we yawn.
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