Heidi Blake, Buzzfeed Investigations Editor and author of "From Russia with Blood," talks about the pattern of killings that flow from the Kremlin. She digs down into why these haven't been gone unsolved. Dr. Rangan Chatterjee, doctor and author of "The Stress Solution," discusses why we're more stressed then ever and the innovative solutions we need to combat it. Our Walter Isaacson sits down with Carmen C. Bambach, a pioneering curator at the Metropolitan Museum of Art, to reflect on the life and works of Leonardo da Vinci, as chronicled in her groundbreaking four volume canon "Leonardo da Vinci Rediscovered."

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