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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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There are 20 feet of blood vessels in each square inch of human skin.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.