Elon Musk on the 'terrible' yet great possibilities of AI

Tesla Inc. CEO Elon Musk famously served as the inspiration for Robert Downey Jr.'s depiction of billionaire genius Tony Stark in Marvel's "Iron Man" movies. Now he's trying to avoid a real-life Ultron moment. In the fictional Marvel universe, Stark originally designed Ultron, an artificial intelligence program, to protect Earth. But when it gained sentience, it turned on its creators and attempted to destroy humanity. Musk doesn't think it's the stuff of fiction.