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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.