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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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The horizontal fraction bar was introduced by the Arabs.