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Why Do We Yawn?
2:31
Why Do We Yawn?
4.6M viewsMar 12, 2014
YouTubeAsapSCIENCE
Why Is Yawning Contagious?
5:45
Why Is Yawning Contagious?
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YouTubeBEHIND THE THINGS
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YouTubeScience Nerd 101
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