"I don't buy that there's nothing that excites you, or as nothing has ever excited you. So if you start to ask those questions and start to introspect, you may be surprised at what you're not considering when you ask yourself that question," he says. "What is it that makes you, like, your brain tick? Like, do you like creative work, or do you like problem solving work?" And then we get to the physiologic and physio-physiological side of how our brains are wired in different ways. Some people really like working 24 hours a day for one week; others love routine.