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

That's okay. You asked for real data. You can find more if you care to search peer reviewed articles. I'm not trying to convince you of anything, just showing that it is a real topic of study.

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