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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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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.