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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.