Mechanics, Electronics, Machines, Innovations! If it moves, has Gears, or contains almost any kind of tech i probably know somewhat about it and can usually fix it. (I just love tech <3.)
Tactics and Weapons in pretty much any form. Always had a knack for them, and while i'm probably not the best i can hold my own in almost any case.
Medieval Weapons Combat or SCA Fighting as its now called. I don't lose much.
That's really all i should say. After all, if i said too much you'd probably look at me funny. Just be assured that i am far smarter than i seem. (But then again who isn't hmm?)
((Also warning... I talk too much so you might have to tell me to shut up if i'm bothering you.....))