Bill Cunningham

I go out every day. When I get depressed at the office, I go out, and as soon as I'm on the street and see people, I feel better. But I never go out with a preconceived idea. I let the street speak to me.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

I really love laser-cutting. I do a lot of laser-cut jewelry and laser-etched stationery. I'll even etch my food sometimes. You can download an image online and etch it onto a tortilla or a brownie. It's so cool to meld the digital and analog worlds together.