Which winner of the "are you smarter than a 5th grader?" Also made a guest appearance on cbs' big bang theory?
The Terminator Decoupling:  The episode features guest appearances by actress Summer Glau and cosmologist George Smoot. George Smoot: George Fitzgerald Smoot III (born February 20, 1945) is an American astrophysicist, cosmologist, Nobel laureate, and one of two contestants to win the 1 million prize on "Are You Smarter than a 5th Grader?
George Smoot