NYTimes.com: He is good-natured, funny, and thought to be among the smartest men in physics: Frank A. Wilczek, 58, a professor at the Massachusetts Institute of Technology, was one of three winners of the 2004 Nobel Prize in Physics and is a frequent columnist for Physics Today.The award came for work Wilczek had done in his 20s, with David Gross of Princeton University, on quantum chromodynamics, a theoretical advance that is part of the foundation of modern physics.The New York Times provides an edited version of two conversations with Wilczek, in October and this month.