I'm a huge huge fan of the golden days of NASA (though I think its current state is one of misery and stagnation) and I'm a big supporter of privately-developed spaceflight. I'm also a computer/general technology nerd.
In terms of science, I am decent at astronomy, evolution, and basic physics. I'm not so good at biology, though I do think that the theories on evolution make sense, and I like genetics theory. I haven't touched chemistry in God knows how long.
Oh, and while I'm not an expert on dinosaurs or ancient extinct species, I do enjoy discussing extinction-level events. I wonder what that says about me...