If the robots take over, at least Elon Musk will be able to say "I told you so." The billionaire inventor loves to make the impossible possible, but he is deeply afraid of artificial intelligence (AI). On Twitter this weekend, Musk said that "we need to be super careful with AI," adding that they are "potentially more dangerous than nukes." If that weren't concerning enough, Musk followed up his statement with another tweet that read: "Hope we're not just the biological boot loader for digital superintelligence. Unfortunately, that is increasingly probable." Both are scary enough — one compares sentient networked robots with the most dangerous weapon on earth, and the other suggests we're merely the fleshy precursors to robot dominance. This isn't the first time that Musk has let known his feelings on AI.