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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Medication errors are three times higher among children and infants than with adults.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.