Sheldon hires an attractive grad student named Alex Jensen to help him with reading his preschool works to find out if he has made a breakthrough regarding the Higgs boson particle. Amy gets jealous and asks Penny to spy on her at Caltech, only to find out that Alex is flirting with Leonard instead. Meanwhile, Howard informs Bernadette that he needs to stay in space for an additional 7-10 days.

Episode name: “The Higgs Boson Observation”

Air date: October 11, 2012