So you have to have the kind of memory that you need for the kind of things you want to do. And you do those things which are easy and you don’t do those things which are hard, so you get better and better by doing the things you do well, and eventually you become either a great tennis player or a good inventor or whatever, because you tend to do those things which you do well and the more you do, the easier it gets, and the easier it gets, the better you do it, and eventually you become very one-sided but you’re very good at it and you’re lousy at everything else because you don’t do it well.
