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Your heart beats over 36 million times a year.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.