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Leonard starts to reconsider his friendship with Sheldon; Wolowitz tries to choose his astronaut nickname.
Sheldon goes to work with Amy in her neurobiology lab when the university forces him to take a vacation; Bernadette asks Howard to sign a prenup.
Sheldon and his nemesis, Kripke, compete for a corner office; Penny feels uncomfortable after receiving a gift from Amy.
Sheldon's routine is turned upside down when his barber gets sick; Wolowitz questions his decision to go into space.
Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party; he gets a lesson from Penny and Amy.
When Penny buys Leonard and Sheldon "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock; after a blind date, Raj believes he has met his future wife.
When Stephen Hawking comes to lecture at the university for a week, Wolowitz is given the task of maintaining his wheelchair, making Sheldon green with envy.
Michael anticipates going to New York for the company's Website launch party; Dwight tries to sell more paper in one day than the Website does.