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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 the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.