Throughout history, investing has been a lot more “Art” than “Science.” But today, data is widely available and it’s a key tool you can use to enhance your portfolio returns. In this episode, Barry Ritholtz speaks to Jim O'Shaughnessy, former chairman and founder of O'Shaughnessy Asset Management (now part of Franklin Templeton) and author of the New York Times bestselling book, “What Works on Wall Street” -- the first quantitative investing book available to the general public.