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Here's Why Yawning Is So Contagious

Justin GmoserJul 16, 2013, 00:30 IST

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Have you noticed the domino effect that occurs when someone in the room lets out an unnecessarily long yawn?

Well, there's a reason why yawning is so contagious.

Take a look as we present some of the current theories below. Chances are you already yawned simply reading this. (Good luck with the video.)

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Produced by Justin Gmoser and Will Wei