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Did you know?
There are more bacteria in your mouth than there are people in the world.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The horizontal fraction bar was introduced by the Arabs.
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There are more sensory neurons in the tongue than in any other part of the body.
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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.