Steven Levitt is one of the authors of Freakonomics and a professor of economics at the University of Chicago. He's also something of a railbird and an adviser to Derby Jackpot, a legal online horse betting website. Dive into the discussion below and ask him about handicapping tomorrow's Kentucky Derby (or about sports gambling or crime in America or behavioral economics or really anything at all).

Update, 2:20 p.m.: Steven's done. Everyone say bye.