The idiom, "jack of all trades, master of none," has been a long standing driver of specialization. Success coaches have long preached the idea that specialization is the key to a prosperous career. Zigzaggers and late bloomers should take note that the numbers suggest otherwise. David Epstein, author of Range: Why Generalists Triumph in a Specialized World came to speak with On Second Thought about the advantages of being a generalist. Meet the author at 7 p.m. at Manuel's Tavern, 602 North