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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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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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People about to have surgery must tell their health care providers about all supplements they take.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).