I tried to make a list of all the things and sub-things and related things that I might want to study in grad school.
It was really hard.
So now I'm trying to make a diagram of all the things and sub-things and related things that I might want to study in grad school. That's hard, too. And now I'm extremely late for the gym.
New idea for tomorrow: Start here; cross off all the things I don't want to do. It worked for picking majors.