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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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There are 20 feet of blood vessels in each square inch of human skin.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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The horizontal fraction bar was introduced by the Arabs.