Big Bang Theory: The Bat Jar Conjecture

"The Bat Jar Conjecture" is the thirteenth episode of the situation comedy series The Big Bang Theory. It was directed by James Burrows with a script written by series creators Chuck Lorre and Bill Prady. It first aired on CBS on Monday, April 21st, 2008. In this episode, a hot chick from Nebraska named Penny moves to Pasadena to pursue a career in acting. She meets her next door neighbors, Leonard Hofstadter and Sheldon Cooper, who are both brilliant scientists, but also ultra nerds. Their best friends are two similarly geeky social outcasts named Howard Wolowitz and Raj Koothrappali. Penny enlists Leonard and Sheldon's aid in helping her move in to her new apartment.