Fri 24 Feb 2006
Why do we yawn?
Posted by Jon Haynes under Science, Uncategorized
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I would like to pose a question that has been intriguing me somewhat lately. Why do people yawn; what is the purpose for it. We know people do it when they are tired, and that when you yawn your lungs fill with air and push the diaphragm down. My question however is what purpose does that serve; is it to expel excess carbon dioxide, and if so why?
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