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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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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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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).