I think there's a strong correlation between hard problems and intelligent people being passionate about them. You probably won't find many intelligent people

I think there's a strong correlation between hard problems and intelligent people being passionate about them. You probably won't find many intelligent people that are particularly interested in standing in queues, driving a cab or waiting tables. That's because these aren't hard things to do. On the other hand you'll find surprisingly many intelligent people that are passionate about how ants build nests, how quasars work and how to solve a rubiks cube because these are hard problems.