"Baseball leads its fans through various aspects of mental skill development—pattern recognition, numerical calculation, correlation, inferencing, understanding of uncertainty, probability, risk and reward. It also teaches that a little knowledge is a dangerous thing. In baseball as in other fields, as soon as we master received wisdom, we tend to assume we know more than we do. It’s one thing to be conversant in a field, but it’s entirely another to grasp the limits of one’s own understanding. Baseball has taught me many times that I’ve been quite wrong about something, after I had been utterly convinced by my detailed knowledge that I must be right. Expertise does not automatically confer wisdom, or even correctness."