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Did you know?
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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The familiar sounds of your heart are made by the heart's valves as they open and close.