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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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).