Science Magazine

What Makes Us Yawn?

Posted on the 26 December 2011 by Gerard @presurfer
What Makes Us Yawn?image credit
Next time you're in a meeting, try this little experiment: Take a big yawn, cover your mouth out of courtesy and watch to see how many people follow suit. There's a good chance you'll set off a chain reaction of deep breaths and wide-open mouths. So what's behind this mysterious epidemic of yawning?The Presurfer

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