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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.