I don't mind calling an obsession an obsession if it occupies every waking hour of my day, though it seems to be increasingly un-PC and now we talk about 'special interests.' All that aside, what's everyone interested in?
For me as a child it was dinosaurs, then Ancient Egypt and then Pokemon, in that order.
Rail enthusiast - volunteer at a heritage railway in fact. In a minority in that community (although the balance is changing) in that I prefer diesel and electric to steam.
I have always thought working at a heritage railway must be really rewarding. I like tinkering and fixing old machinery and one of my partners friends helps to restore old trains. Seems like a great thing to do and it's something I would like to look at later in life.