Bob Iger, the CEO and Chairman of the Walt Disney Company, sits down with Christiane Amanpour in New York for a frank conversation about his career and his new book, "The Ride of a Lifetime: Lessons Learned from 15 Years as CEO of the Walt Disney Company." Martin Kemp, Emeritus Research Professor in the History of Art at Oxford University and the author of "Leonardo by Leonardo," talks to our Walter Isaacson about 500th anniversary of Leonardo da Vinci's death.

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