I get stubborn and dig in when people tell me I can't do something and I think I can. It goes back to my childhood when I had problems in school because I have a learning disability.
A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If, as some evidence suggests, exotic micro-organisms have arisen independently of terrestrial life, studying them could revolutionise biology, medicine and biotechnology.
I do all kinds of roles - nerd, psycho, nerd, psycho, nerd, psycho - and occasionally someone kind of normal. It's weird, when I lived in Austin I was always cast as pretty normal people. But when I moved to Los Angeles I was immediately branded a psycho.