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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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There are 60,000 miles of blood vessels in every adult human.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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.