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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Illicit drug use costs the United States approximately $181 billion every year.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.