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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.