From "The Contractual Obligation Implementation" episode, the guys went back to Howard's old middle school to talk to female students and get them interested in the sciences. They did it due to their employment contract and were not very successful until Sheldon decided to contact Amy and Bernadette (who are female scientists themselves) for help. Piper Mackenzie Harris as Girl #1 Diamond White as Girl #2 Seaonna Chanadet as Girl #3 (Eye rolling girl)