Am reading Super Freakonomics tonight after swimming at the “Y”. Consider this:
In 1960, about 40% of female teachers scored in the top quintile of IQ and other aptitude test, with only 8% in the bottom. Twenty years later, fewer than half as many were in the top quintile, while more than twice as many in the bottom.
…
Between 1967 and 1980, U.S. test scores fell by about 1.25 grade-level equivalents.
Jeepers.