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    3. what is a yawn
    what is a yawn

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    0  Views: 357 Answers: 4 Posted: 13 years ago
    Tags: questions about the body
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      4 Answers

      It is what we do when we read a question like this
      13 years ago. Rating: 2
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        There is plenty of speculation on this subject, but science hasn't came up with a definitive answer yet.
        13 years ago. Rating: 1
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          I thought it was a lack of oxygen to the brain.
          13 years ago. Rating: 0
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            I think it's a reaction caused by the cooling of the brain.
            13 years ago. Rating: 0
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