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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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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.