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There are more bacteria in your mouth than there are people in the world.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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.