Watson Mixes Drinks; Streetfight: Moses, Jacobs, Sadik-Khan

Is artificial intelligence a threat to "human culture and history" or a pleasant addition to it? DnA meets Watson and considers the implications of assistance from 'cognitive computing' in our daily lives. Plus, a new opera dramatizes the epic battle between Robert Moses and Jane Jacobs, and Janette Sadik-Khan continues the fight over the streets of New York.

Host Frances Anderton looks at design and architecture from a Los Angeles perspective.