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A very interesting read:
The 1910s saw the rise of intelligence testing, along with the eugenics movement, and the introduction of the term “intelligence quotient” (IQ). Now that psychologists had a definite scale they could offer strict, numerical definitions for all our favorite mental disabilities. People with an IQ between 0 and 20 or 25 were classified as idiots; people with IQs between 20 or 25 and 50 were imbeciles; and people with IQs between 50 and 70 were morons. Morons were clearly the highest-functioning group in all cases, and ranked just below the dull-minded (who ranged from 70 to 90)