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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.