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    3. Why do we Yawn?
    Why do we Yawn?

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    0  Views: 609 Answers: 2 Posted: 15 years ago
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      It is something that is not fully understood, some say it is an early form of communication, notice that when you yawn, it is contagious, person next to you yawns. I don't believe that it is to draw in more oxygen, or else we would yawn after a run rather than pant.
      15 years ago. Rating: 0
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        its a lack of oxygen to our brains
        15 years ago. Rating: 0
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