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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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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.