Computer animations of yawning chimpanzees provoke the same response in real chimps, according to a new study. Contagious yawning is well known among humans, and earlier studies have shown that chimps ...

Watch the video above. Did you yawn? Contagious yawning occurs when someone around you yawns and you yawn in response. It's an involuntary response. Humans do it, and so do chimpanzees. In chimps, ...

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