IIRC (from reading Caplan's case against education) this outcome in itself is not terribly controversial. What may be is the idea that educational IQ gains are

IIRC (from reading Caplan's case against education) this outcome in itself is not terribly controversial. What may be is the idea that educational IQ gains are sticky beyond the period of schooling. E.g. school raises IQ while you're in it, but over time you lose those gains and at some point they disappear completely.