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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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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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There are 20 feet of blood vessels in each square inch of human skin.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.