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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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The FDA recognizes 118 routes of administration.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.