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    3. Why do people yawn?
    Why do people yawn?

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    +1  Views: 378 Answers: 3 Posted: 12 years ago
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      3 Answers

      Although scientists still cannot pinpoint the exact biological mechanisms of a yawn, they agree that it is an involuntary reflex that controls the oxygen and carbon dioxide levels in the blood.
      12 years ago. Rating: 4
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        Because they're too tired or too bored...like me right now (yawwn :O)
        12 years ago. Rating: 3
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          Yawning cools the brain and increases blood flow. Thus making it efficient.
          12 years ago. Rating: 2
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