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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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The horizontal fraction bar was introduced by the Arabs.

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

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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