Ken Jennings has brought us many things: the secrets to Jeopardy!, an increasingly confusing series of patterned suits, and now, awareness of the existence of a series of Welcome Back, Kotter ...

G abe Kaplan, 80, has had a long and diverse career that took him from stand-up comedy beginnings to his more recent run as a world-champion poker player and commentator. But we all know him best as ...