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Yawning is a universal phenomenon, observed in many vertebrate species, from wolves to parrots, and, of course, humans, from a very early age. But why do we tend to yawn when we see someone else doing ...
It’s ancient, unstoppable and strangely contagious. Here’s what science now knows about the humble yawn, and why evolution never got rid of it. You’re reading this sentence, and there’s a reasonable ...
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