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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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There are 20 feet of blood vessels in each square inch of human skin.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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