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Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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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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Your heart beats over 36 million times a year.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.