It's kinda strange really, when we're bored or tired we yawn, why?

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Answers:    So we get more oxygen flow to the brain to rouse us up.

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That's one of those questions...that nobody know...

Thats just how it is...

My girlfriend is of mexican heritage,her mom say when someone yawns,there soul comes out of in that bodies or something like that.
Some populace believe yawning is contagious. If you see someone yawn,you'll most likely do it yourself.

Whatever your proposition is,pick one,sit back,and relax! =]

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nouns of oxygen to the brain

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