Evil artificial intelligences are luckily confined to fiction. Yet leading scientists claim that intelligent machines are 'the most serious threat facing mankind'. Are they right or could a mind free from human prejudices create a better world? Or is all talk of artificial intelligence a deluded fantasy?

Physicist Roger Penrose, computer scientist Nigel Shadbolt and novelist and digital age icon Warren Ellis consider the threat of intelligent machines. Gabrielle Walker hosts. Sponsored by Wired.

From the Institute of Art and Ideas collection.