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Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider in Switzerland on Valentine's Day.
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
Sheldon winds up in traffic court when he gets a ticket because of Penny.
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.