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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.