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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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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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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.