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Your heart beats over 36 million times a year.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.