Nobel-prize winning physicist Steven Chu speaks during a press conference after President-elect Barack Obama nominated Chu as energy secretary on Monday, December 15, 2008, in Chicago, Illinois. (Nancy Stone/Chicago Tribune/MCT)
Nobel-prize winning physicist Steven Chu speaks during a press conference after President-elect Barack Obama nominated Chu as energy secretary on Monday, December 15, 2008, in Chicago, Illinois. (Nancy Stone/Chicago Tribune/MCT) MCT
Nobel-prize winning physicist Steven Chu speaks during a press conference after President-elect Barack Obama nominated Chu as energy secretary on Monday, December 15, 2008, in Chicago, Illinois. (Nancy Stone/Chicago Tribune/MCT) MCT