> But if the tests were getting harder, and the average score was steady at 100, people must have been getting better at them. It would seem they were getting m

> But if the tests were getting harder, and the average score was steady at 100, people must have been getting better at them. It would seem they were getting more intelligent. But the average score of IQ is 100 by definition. It doesn't matter whether the test is hard or easy, since the score system is determined by the average performance of people on the test. So even if a test was nearly impossible and nobody got more than 2-3 questions right, the average result would still be 100, because the points would be computed accordingly.