You're Like Spitting Cobra and 46 Unexpected Body Facts

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Whenever we yawn, muscles in our mouth and tongue can squeeze some of the saliva-producing glands in there. As a result, we might squirt a tiny stream of saliva without even noticing it! Yeah, just like a spitting cobra! But what is saliva anyway? And what about tears? Or how much information does your brain hold? Here are the most surprising human body facts I bet even your teachers don't know!

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