What is your favorite non-fiction genre?

Philosophy

I gravitate to psychology and philosophy primarily. I'm a sucker for anything by Erich Fromme, C.G. Jung, Jiddu Krishnamurti, John Dewey, and Noam Chomsky.

I really like history, biographies, current events, philosophy, and theology. I've recently got into the reading of sociology, reason, logic, and rhetoric. I also attempt to read a bit of politics here, a little economics/business writing there. I am attempting to lace my reading with a bit of everything, just so I can attempt to understand why people like these genres

First and foremost: The Middle Ages
Second: Travel
Third: Crime

Odd combo isnt it...