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Cyanide works by making the human body unable to use oxygen.
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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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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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The horizontal fraction bar was introduced by the Arabs.