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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.