I'm a scientist. I try to rationally think about the world at all times. It's difficult. I fail, because I am a human, and we are squishy bags of water and emotion. But the effort is worthwhile, I think.
Introspection like this is the kind of thing you can bury yourself with, so I copped out and asked a couple friends for a one sentence summary of me, and here are the results (so far):
"Well, I would say you're a kind, thoughtful, sometimes a little over-analytical scientist with a big brain and a big heart and a really awful sense of humor."
"I think you're very passionate and dedicated, and you want to strive for the best in everything."