Ep 12. The Jerusalem Duality

In season 1, episode 12 of The Big Bang Theory, titled "The Jerusalem Duality," the gang is introduced to Sheldon's arch-nemesis, Dr. Leslie Winkle. When Sheldon invites her over to their apartment to test her hypothesis, the two butt heads over their differing theories. Meanwhile, Howard becomes infatuated with Leslie and tries to woo her with his sleek moves. While this is all happening, Leonard prepares to give a presentation at a scientific conference in Jerusalem, but soon realizes that he is not prepared to face his rivals in the field. After some good-natured encouragement from his friends, Leonard is able to gain the confidence he needs to present his work with confidence and poise. Overall, "The Jerusalem Duality" is a fun and exciting episode that highlights the quirky personalities of the show's beloved characters.