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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.