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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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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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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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The average adult has about 21 square feet of skin.
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The longest a person has survived after a heart transplant is 24 years.