Why do we yawn?
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YouTubeBEHIND THE THINGS
Why do we yawn?
Why do we yawn? Discover the surprising science behind this everyday action! Yawning cools the brain, increases oxygen, and even relaxes your muscles. And don't forget how contagious it is! Ever wondered why we cover our mouths when we yawn? Find out in this quick, engaging video. Watch till the end, and let us know if you yawned too! Subscribe ...
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