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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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The average adult has about 21 square feet of 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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).