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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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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 calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.