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The human body produces and destroys 15 million blood cells every second.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.