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There are more bacteria in your mouth than there are people in the world.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.
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.