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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The average office desk has 400 times more bacteria on it than a toilet.

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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

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The longest a person has survived after a heart transplant is 24 years.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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