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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 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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.