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Why Do We Yawn?
2:46
YouTubeSciShow
Why Do We Yawn?
Why do we yawn? If you think the answer is BOR-ing, then maybe your brain's just overheated. Let Hank explain the new thinking behind why we ... hold on ... *yawn*. Excuse me. Help support us by subscribing to our page on Subbable: https://subbable.com/scishow ---------- Like SciShow? Want to help support us, and also get things to put on your ...
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