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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.