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Why Do We Yawn?

Why Do We Yawn?

The unexpected truth behind the science of yawning.

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Added: Jul-31-2007 
By: iraqtube
Tags: yawning, why, science, abc, ask, question, amazing, fun, funny, iraqtube
Views: 21469 | Comments: 15 | Votes: 0 | Favorites: 1 | Shared: 24 | Updates: 0 | Times used in channels: 1
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