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SciShow: Season 2014

2014x58 Why Do We Yawn?

  • 2014-04-15T04:00:00Z on YouTube
  • 10m
  • United States
  • Documentary, Special Interest
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.
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