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Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.
Penny finds herself along for the ride on Sheldon's first date ever; while Wolowitz finds a new use for a robotic arm.
The guys are concerned as Sheldon searches for an alternative to human companionship.
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.