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

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    +1  Views: 406 Answers: 3 Posted: 14 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.
      14 years ago. Rating: 4
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        Because they're too tired or too bored...like me right now (yawwn :O)
        14 years ago. Rating: 3
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          Yawning cools the brain and increases blood flow. Thus making it efficient.
          14 years ago. Rating: 2
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