Yawns are weird. You’re tired? Why don’t you open your mouth really big about it? What’s that? You’re not tired, but you saw someone else open their mouth big? Well, guess what.
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[–] 2 points 11 months ago*

Sounds like a plausible theory. I wonder how extensively it's been studied. I'd like to know if it's unique to humans. Figuring out which species do it would give a clue to when it evolved

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