Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.
The nucleus of Halley's Comet, taken by the Giotto probe in 1986