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Author Question: At which stage do tumors produce substances that encourage the growth of blood vessels to supply ... (Read 17 times) |
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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 human body produces and destroys 15 million blood cells every second.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.