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Whatever The Reason, I'm Doing It Now
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It's one of the most baffling questions in science, and nobody has figured the answer out over 2.500 years of study. The cure for the common cold? No, the real question is: Why do we yawn? Is it primitive communication? A way to pump fluid to the brain? A way to cool the brain? The latter may be the answer, but nobody knows. And I bet you yawned while reading this. (BBC)
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