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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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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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There are approximately 3 million unintended pregnancies in the United States each year.