Whether on Earth or above it, hilarity is outrageously universal in TV's most popular comedy featuring four forward-thinking but socially backward geniuses. Fun discoveries multiply: Leonard learns jealousy is bad for a relationship (with Penny) but science is good for seduction (of Penny). Howard finds life on the International Space Station is no escape from terrestrial turmoil between his overbearing mom and his new wife Bernadette. Raj meets someone special who may be a good match, if only he can keep her from fleeing mid-date. Even Sheldon learns a few things: a) what not to say when called in to meet the university's employee relations director, b) what happens to childhood TU idols and c) that a Dungeons & Dragons adventure can be the icebreaker his relationship with Amy needs. For those who need laughter with scientific regularity, this 2-disc, 24-episode Season Six set of The Big Bang Theory will rock your cosmos.