Most of the contributors appear to have interpreted "dangerous" as meaning something like "subversive," challenging to one or another received orthodoxy. ... In that spirit, here is my dangerous idea: Every child in school deserves an individual IQ test. ... And the corollary: Every statistical analysis of school- and district-level data should include individual IQ as one of the variables measured. ... Why is that subversive? Because so many people, especially in education, are terrified to admit that individual IQ has anything to do with academic achievement, because it is not evenly distributed demographically.