I'm an environmental engineer and I'm slightly obsessed with water. Odd perhaps, but the whole topic is fascinating. I see it as one of the few things that requires knowledge of the whole breadth of science, both social and technical, from physics and chemistry to geo-politics and economics. Also, apparently I talk with my eyebrows really high on my face when I get animated, which is pretty often.
When I'm not geeking out over obscure Dutch professors, I climb, cycle, do aerial silks, practise yoga and geek out over other things instead. Oh, I also badly attempt to play sax. Getting better quickly though.