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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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There are 20 feet of blood vessels in each square inch of human skin.
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Everyone has one nostril that is larger than the other.