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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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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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