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John L.

asked • 10/17/13

Why are yawns contagious?

Does anyone actually know the answer to this? 

1 Expert Answer

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Naina B. answered • 10/18/13

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4.8 (155)

Naina, a versatile tutor

Naina B.

please look at journal for additional related articles on this topic.
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10/18/13

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