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The longest a person has survived after a heart transplant is 24 years.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.