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The guys are concerned as Sheldon searches for an alternative to human companionship.
Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.