Watch videos that will make you yawn on Yawn Vide's YouTube channel.

Find out why we yawn: http://bit.ly/1glgLOO How long can you last before yawning? Let us know in the comments!

OK, so a yawn is a cool-down, yes. But it works because stretching the jaw increases circulation. And that pumps warm blood out of the brain, while inhaling deeply brings fresh air into your...

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Mar 14, 2014 · The folks over at ASAP Science have pulled out their dry-erase markers to explain why we yawn.

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Yawning opens up something called your eustachian tube, a small passageway connecting your throat to your inner ear. This allows air to come into your middle ear, equalizing pressure.

Mar 12, 2014 · Watch the 'Yawn-O-Meter': http://bit.ly/1qwFDrx SUBSCRIBE: http://bit.ly/10kWnZ7...more. What makes yawning so contagious?