TIL yawning is observed in almost all vertebrate animals and is "contagious" across species. There is no consensus on why yawning occurs.
TIL yawning is observed in almost all vertebrate animals and is "contagious" across species. There is no consensus on why yawning occurs.
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It's from when caveman wanted to leave their friends cave and go home, but can't get an ugg in and they don't want to be rude.
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