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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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There are 20 feet of blood vessels in each square inch of human skin.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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