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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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Cyanide works by making the human body unable to use oxygen.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.