Season 4, Episode 16 The Cohabitation Formulation
First Aired: February 17, 2011
Howard contemplates a serious decision in his relationship with Bernadette; and Leonard and Raj's sister start seeing each other again.
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- Premiered: September 24, 2007
- Rating: TV-PG
- Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)