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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Your heart beats over 36 million times a year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.