Stuart Firestein is the Professor and Chair of the Department of Biological Sciences at Columbia University, where his highly popular course on ignorance invites working scientists to come talk to students each week about what they don't know. Dedicated to promoting science to a public audience, he serves as an advisor for the Alfred P. Sloan Foundation's program for the Public Understanding of Science and was awarded the 2011 Lenfest Distinguished Columbia Faculty Award for excellence in scholarship and teaching. He was also recently named an AAAS Fellow.