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6. It takes seventeen muscles to smile and forty-three to frown.

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5. Your skeleton keeps renewing itself every ten years, which means that every decade you get a new skeleton.

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4. In case you ever wondered what the strongest muscle in the body is, it is the tongue, while the hardest bone in the body is the jawbone.

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3. Contrary to popular belief sweat doesn’t smell bad. Body odor is caused when the skin’s bacteria feed on sweat. So, bacteria’s waste products cause this horrible odor.

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2. Inside your belly button “live” thousands of bacteria that could literally form an ecosystem the size of an entire rain forest.

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1. According to most scientists, humans are the only animals on earth who produce emotional tears.

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