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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.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.