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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.