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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.
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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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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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 the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.