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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.