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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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The horizontal fraction bar was introduced by the Arabs.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.