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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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.