On average, everyone returns to the average. This is about the _rate_ of cognitive development. And it's easy to measure with standard tests. Obviously there are a ton of accomplished Asians in America, its just more difficult to identify them in adolescence. There' nothing bigoted about that.
Sorry for posting it a lot, its just relevant to what I wanted to say in my other comments.
Sorry for posting it a lot, its just relevant to what I wanted to say in my other comments.