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1 Quotes for 'Why Yawning Is Contagious' in the Database.

Pages: 1 

 :: Author »  Letter "W" »  Why Yawning Is Contagious Quotes
You yawn to equalize the pressure on your eardrums. This pressure change outside your eardrums unbalances other people's ear pressures, so they must yawn to even it out.
Topic: Yawns
Source: None

Pages: 1 


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