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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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Your heart beats over 36 million times a year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.