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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.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
In 1864, the first barbiturate (barbituric acid) was synthesized.
Everyone has one nostril that is larger than the other.
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