More than 1,300 experts call AI a force for good

That letter suggested super-intelligent AI posed an "existential risk" to humanity. This was a view echoed by film director Christopher Nolan, who told the BBC that AI leaders he spoke to saw the present time "as their Oppenheimer moment". J.Robert Oppenheimer played a key role in the development of the first atomic bomb, and is the subject of Mr Nolan's latest film.