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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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The FDA recognizes 118 routes of administration.
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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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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.