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Did you know?
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.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.