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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.