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Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Blood is approximately twice as thick as water because of the cells and other components found in it.