CUBAN SPYCRAFT – For decades, prolific Cuban spies working in the U.S. government, serving in high-profile positions with top security clearances, have evaded American intelligence officials. Correspondent Cecilia Vega reports from Washington, D.C., and Miami on the stories of two such undercover agents, former U.S. ambassador Victor Manuel Rocha and onetime Pentagon official Ana Montes. Cuba continues to supply one of the most dangerous exports to American adversaries around the world: American secrets. Michael Rey is the producer.NVIDIA – This year, computer chip maker Nvidia soared to the top of the stock market, briefly surpassing Apple as the world's most valuable public company. Nvidia ushered in the artificial intelligence revolution with its groundbreaking software and graphics processing unit, a chip that enables AI by accelerating the processing power of computers. Correspondent Bill Whitaker meets Nvidia's CEO and co-founder, Jensen Huang, to discuss the company's innovations and the rapidly expanding range of AI applications, including drug development, weather pattern prediction, and more. Marc Lieberman and Cassidy McDonald are the producers.FINDING CILLIAN MURPHY – Ahead of last year's Academy Awards, correspondent Scott Pelley joined enigmatic actor Cillian Murphy in Ireland for a candid interview before winning Best Actor in the blockbuster film "Oppenheimer." Pelley talked to the Oscar winner about how he transforms for roles, acts on instinct, and how his Irish identity has defined him. Nicole Young is the producer.