When I was in college, I was often doing what I wasn't supposed to. Do you know people who need to study for a test and can sit for four hours straight, methodically reviewing one fact after the next, never taking their mind off their notes? Their attention never wavers. My attention always wavered. Whenever I went to the library to get the book I needed, I was fascinated by the book next to it, or a few books over. Suddenly they seemed much more important than the book I was supposed to read. When I was supposed to be...