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Question: What do yawns mean?

July 29, 2014
Dr. Jim Surrell (sosdietdoc@gmail.com) , Mining Journal

A yawn is generally defined as the involuntary act of opening one's mouth wide and inhaling deeply due to tiredness or boredom. In humans, yawning most often occurs in adults immediately before and after sleep, and very often in response to seeing another person yawn.

 
 
 

 

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