Interesting thing, unlike most people with Asperger's, I never really seemed to have any true obsession. I would be as enthusiastic about learning anything as I was about learning everything else. But, I believe I recently discovered what it is.
Stories.
It's an exceptionally broad fascination, and encompasses almost everything, from psychoanalysis to astronomical phenomena, to the emergence of a self functioning economy in a virtual world. Drug addictions, the validity of FTL travel, A.I., copper based blood instead of iron to facilitate healing, cryogenics, music, mathematics, DNA, adaptation of viruses, sentient behaviors and increased classification of life, metaphysics, philosophy, cultural ideology, religion, and bio-chemistry (just to name a few). And though I probably haven't pursued each of these subjects as astutely as a person with a finite area of expertise, I have more practical and theoretical knowledge on all of them than almost anyone (not trying to sound arrogant).
The point is, anything that can possibly influence a story, I have an acute interest in. And since stories can really be about pretty much anything and everything, I pursue knowledge in pretty much every field.
I also like it because I can hold conversations with people on practically every subject. And if I can't, I usually pick it up fairly quickly.
So... Those are my thoughts.
