Walter Isaacson: Elon Musk Has 3 Modes

Walter Isaacson: "He has a mode that's engineering mode, where he can do things, like, figure out how to do a rocket landing upright and catch it with the arms. And he has a very giddy mode and a silly mode. But he also has what one of his friends calls demon mode, which is, when he gets really dark and he's really intense about something, there's no distracting him, and he can leave a lot of rubble in his wake."