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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.