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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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There are 20 feet of blood vessels in each square inch of human skin.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.