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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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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.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.