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Yawn baby yawn
Unexplainable
Is There a Better Hypothesis?
Scientists still don't know exactly why we all do it. Andrew says that yawning has to do with the temperature of the brain. Blood further from your brain is cooler, so if you send more blood to your brain, it cools the brain. If this stretch is doing something important for the brain, a bigger brain might need a bigger yawn or a longer yawn.
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