> I think there should be strong correlation between average time children are schooled and standardized test scores. Surely the simpler explanation is that th

> I think there should be strong correlation between average time children are schooled and standardized test scores. Surely the simpler explanation is that the tests don't really measure "pure" intelligence, and the results are affected by all sorts of social features, including a general familiarity with IQ tests. Time-in-school is part of that.