When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Enamel is hardest substance in the human body.
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A person will create enough saliva to fill two average size swimming pools during his lifetime.
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By weight, Bone is five times stronger than steel.
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Obsessive nose picking is called Rhinotillexomania.
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