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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.