Technology. I find it interesting because of how it works, and all that it is capable of. I really like searching through a computer, finding problems, and solving them, and learning more about them, i learn from it too, and have the feeling of being proud of solving something.
Nature, because it's not man made.
People- no two are alike
Criminal behavior
Looking things up pertaining to the medical field, the study of the mind and why people do the things they do, as well as weird germs or pictures to take me further into knowledge. I like learning about pharmaceuticals, interactions, etc.... Basically anything medical related except for the eye! I get squeamish when it comes to the eye!
Religion -
So many cultures are built up around them, it shapes the way people think and produces some interesting "Worldviews" . . .
Neuroscience -
It tries to answer the question about why we are the way we are on a semi-individual level . . .
Evolution, Soul Transfer, The Exchange Program.