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What makes someone yawn

+3 votes
asked May 7, 2014 in Alternative Medicine by anonymous
   

2 Answers

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It is exists to cool down the brain.
answered Mar 10, 2017 by BobTheAnswerGuy Inquisitive Expert (310,070 points)
+3 votes
high blood co2 level.
answered Jan 15, 2018 by anonymous

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