Are you frustrated that ERA is not adjusted for park and for run environment? Do you want a way to convince your friends that Mike Henneman was in fact the best pitcher in Tigers history? Then ERA+ might be the stat for you. Mark and Andy tell you how to calculate it, why it's good, why it's bad, and who has been the best and the worst in history using the stat as the measuring stick. Wrap it up by playing along in a round of Roll The Stat, and see how much your ERA+ knowledge has grown in just an hour.