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There are 20 feet of blood vessels in each square inch of human skin.
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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.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The familiar sounds of your heart are made by the heart's valves as they open and close.