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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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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The horizontal fraction bar was introduced by the Arabs.