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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are 60,000 miles of blood vessels in every adult human.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.