Elon Musk says it’s humankind’s greatest threat. James Cameron gave warning in the Terminator films. And now artificial intelligence experts are calling on their own colleagues to ensure we don’t lose control of technology that could potentially enslave or destroy the entire human race. They are signing an open letter from the Future of Life Institute calling for more supervision of super-intelligent machines, particularly autonomous weapons. Signees include Musk, Stephen Hawking and the founders of Google’s DeepMind. Listen now or welcome our new robot overlords later.