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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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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.

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