Bill Gates is a passionate technology advocate (big surprise), but his predictions about the future of computing aren't uniformly positive. During a wide-ranging Reddit "Ask me Anything" session the Microsoft co-founder and billionaire philanthropist outlined a future that is equal parts promising and ominous. Gates was asked how much of an existential threat superintelligent machines pose to humans: "I am in the camp that is concerned about super intelligence," Gates wrote. "First the machines will do a lot of jobs for us and not be super intelligent. That should be positive if we manage it well. A few decades after that though the intelligence is strong enough to be a concern. I agree with Elon Musk and some others on this and don't understand why some people are not concerned."