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    what is a yawn

    0  Views: 356 Answers: 4 Posted: 13 years ago

    4 Answers

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


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