Why We Yawn (And Why It Really Is Contagious)
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. Physiology of Yawning When a person yawns, the stretching of powerful jaw…
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