The average adult has about 21 square feet of skin.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.