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There are 60,000 miles of blood vessels in every adult human.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The average adult has about 21 square feet of skin.
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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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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.