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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.