Schools could do the same thing. Elementary and middle schools could put the January through April-born students in one class, the May through August in another class, and those born in September through December in the third class. They could let students learn with and compete against other students of the same maturity level. It would be a little bit more complicated administratively. But it wouldn't necessarily cost that much more money, and it would level the playing field for those who -- through no fault of their own -- have been dealt a big disadvantage by the educational system. We could easily take control of the machinery of achievement, in other words -- not just in sports but, as we will see, in other more consequential areas as well. But we don't. And why? Because we cling to the idea that success is a simple function of individual merit and that the world in which we all grow up and the rules we choose to write as a society don't matter at all.