I like the sports analogy. If you take any individual team in a particular sport, chances are the recent editions of that team are the most talented in its history, in raw terms. For example, the recent Chicago Cubs teams are almost certainly far bigger, faster, and stronger and better at their sport, in absolute terms, than the Chicago cubs teams of the early 20th century. If you time them all in the 100 m dash, or measured their max benchpress and squat, or any other absolute measure, I bet a whole lot of money the modern team would beat the living hell out of the early 20th-century team, and would beat them on the field, too. Yet, those early 20th century teams won championships, and the modern team doesn't. The cubs have gotten much, much better, but all of the other teams advanced even more. In the same way, education in this country has improved, but it improved more in a lot of other countries.