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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.