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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 first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The average office desk has 400 times more bacteria on it than a toilet.