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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.