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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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).