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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Everyone has one nostril that is larger than the other.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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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.