Elon Musk is worried about artificial intelligence. During a Q&A at the SXSW film festival and tech conference in Austin, Texas, on Sunday, Musk said he is most stressed by production difficulties with the Tesla Model 3 electric car and the dangers of AI. "I'm really quite close, very close to the cutting edge in AI. ... It's capable of vastly more than almost anyone on Earth, and the rate of improvement is exponential.