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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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.