CBS

Season 7: Episode 7 - The Proton Displacement

The Proton Displacement: Sheldon gets offended when Arthur Jefferies (Professor Proton) asks Leonard to read his latest scientific paper. After being repeatedly hounded by Sheldon, Arthur finally relents and asks Sheldon to read the paper, only to learn that Sheldon hacked into Leonard's email and read it already. Meanwhile, Koothrappali joins Penny, Amy, and Bernadette for a girls night where they make homemade jewelry. He gets upset when Wolowitz comes and steals his thunder by teaching the girls how to use his engineering tools to make even fancier pieces of jewelry.