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In his temporary bed over in Penny's apartment, Sheldon waits for Amy.
The Cohabitation Experimentation
Season 10, Episode 4 - Aired October 10, 2016
After Amy's apartment is flooded, Penny suggests that Amy move into Apartment 4A with Sheldon. Unsure about finally cohabiting with his girlfriend, Sheldon comes around to the idea when he looks at it as a five week experiment in living together. Meanwhile, Howard and Bernadette decide not to learn the gender of their baby, but they question their decision when Raj reveals that he knows the sex of the baby.