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There are 20 feet of blood vessels in each square inch of human skin.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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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 more bacteria in your mouth than there are people in the world.
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There are approximately 3 million unintended pregnancies in the United States each year.