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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.