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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.