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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.