There are a few things that even casual fans know about "The Big Bang Theory." For one, it's a show about "nerds." Sheldon Cooper, played by Jim Parsons, says "Bazinga!" a lot. Also, the elevator ...

Kaley Cuoco and Johnny Galecki are together again — for an ad. The former Big Bang Theory costars, who dated off-screen during the show's early seasons, reunited in an advertisement for the Royal ...