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There are 20 feet of blood vessels in each square inch of human skin.
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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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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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Thyroid conditions may make getting pregnant impossible.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.