Enamel is hardest substance in the human body.
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			The human brain has the capacity to store everything that you experience.
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			If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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			The human brain doesn't stop developing until about 25 years old.
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			Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
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			If you are cold you are more likely to be hungry because you use energy to keep warm.
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			Your thumb is about the same size as your nose.
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			The largest cell in the human body is the female egg and the smallest is the male sperm.
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