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Leonard and Sheldon compete for the attention of a famous female physicist.
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
Penny throws herself at Leonard after he returns from three months at the North Pole and they begin a relationship, Penny and Sheldon start a quirky friendship though she can still annoy him, Howard begins to date Bernadette Rostenkowski and Sheldon meets Amy Farrah Fowler.