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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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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.