The result of selection (lower education, etc.) will necessarily lag behind the selection pressure. Only the most extreme selection (immediate 100% death for no

The result of selection (lower education, etc.) will necessarily lag behind the selection pressure. Only the most extreme selection (immediate 100% death for non-selected variant) will show up immediately. Milder selection takes time. You can tell that it is happening if you look at millions of people, but it won't be easy to notice without some number crunching. Suppose the difference is that one group averages 1.7 kids per woman, with typical generation-to-generation time of 35 years, while the other group has 2.1 kids per woman, with typical generation-to-generation time of 20 years. You probably can't notice, especially if those averages are blurred by lots of random variation. It will take many generations to severely reduce the genetic predisposition toward learning. As it happens, it will be difficult to recognize. People learn less, but why? Many alternate explanations will be offered. There may in fact be multiple factors that each partially explain the result. Some of these factors may be taboo. We might explain away the situation by saying that the economy just doesn't support education, or that the culture has changed.