1: Sheldon and Amy's Nobel Prize win.
2: Howard and Bernadette's parenting struggles.
3: Raj's search for love and happiness.
4: Penny's success in her acting career.
5: Leonard and Penny's romantic milestones.
6: The origins of the Big Bang Theory gang.
7: The hilarious antics of the group's friendship.
8: Crossover episodes with other popular TV shows.
9: Exciting new adventures in the Big Bang Theory universe.
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