How about: Education makes you better at intelligence tests. I took the GRE (Graduate Record Exam) before going to Stanford. I got 99%, even though the test covered Engineering areas I had never studied. I did that by noticing, in the areas I did know, that the questions were all about fundamental principles. I could guess at the answers then for fluid mechanics, deformable bodies etc, and apparently got them all right. Am I intelligent? Sure, but not THAT intelligent.