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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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The horizontal fraction bar was introduced by the Arabs.
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Blood is approximately twice as thick as water because of the cells and other components found in it.