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24 June 2018, Sunday
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is yawn contagious

  1. they believed that yawning is contagious. if one person yawns another one yawns too. according to research that human yawn because they are lucking on oxygen and yawning is one process of releasing excess carbon dioxide in your body which is not useful to our body.
    (dolce and garbage, November 27, 2008, 7:43 pm)
  2. it is, providing you yawn without covering your mouth with your hand. if you cover your mouth, the yawn germs cannot spread.
    (Chequer, November 28, 2008, 7:00 pm)

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