Ask Dr. Nandi: Why is yawning so contagious?

WXYZPublished: June 9, 2017Updated: June 10, 20172 views
Published: June 9, 2017Updated: June 10, 2017

If someone near you yawns, you can’t help but yawn too. Yawning is a common behavior but why is it so contagious?

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