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The science of funny is back! At work, physicists Leonard and Sheldon and their geek pals conquer the cosmos. At home, real life from dating to driving conquers them. This season, Leonard gets a girl. So does Sheldon. (Sheldon?!) Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart, berconfident Leslie Winkle reduces mere men to spineless jellyfish. Twenty-three laugh-filled episodes from series creators Chuck Lorre (Two and a Half Men) and Bill Prady (Dharma & Greg) and a talented cast with astronomical comedy I.Q.s show why Big Bang is such a big hit.