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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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