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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.