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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The horizontal fraction bar was introduced by the Arabs.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).


