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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.