Machines are getting smarter. Much smarter. Now they are becoming so powerful, they could pose an existential threat to the human race. That's the warning from some of the greatest minds behind the development of artificial intelligence.

For Panorama, reporter Lara Lewington speaks to some of the so-called 'godfathers' of AI about their hopes and fears and she meets researchers developing technology that allows computers to read our emotions and even our minds. Show less