Why Elon Musk is sounding the alarm on artificial intelligence

Elon Musk is a household name. The South African-born billionaire can seemingly pioneer anything: PayPal, Tesla, SpaceX, and (maybe) the Hyperloop. He's an engineer and a marketer, Steve Jobs and Steve Wozniak rolled into one. But there's one technology he's deeply scared of: artificial intelligence. "AI is a fundamental risk to the existence of human civilization," he warned a meeting of the nation's governors earlier this year.