History of IQ Testing. The abbreviation IQ comes from the term intelligence quotient first coined by psychologist William Stern in the early 1900’s. This term was later used by Alfred Binet and the French government to objectively test and identify children in public schools with special educational needs.
It is an irritant for mammals, including humans, and produces a sensation of burning in any tissue with which it comes into contact. Capsaicin and several related compounds are called capsaicinoids and are produced as secondary metabolites by chili peppers, probably as deterrents against certain mammals and fungi.