Tyra Banks

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 haven't modelled since I was 12 - that was a one-time thing, and I did it as a kid to make a little money to save up for university. Acting is my first love as well as writing and eventually producing and directing.

My first job in TV was hosting this young teen magazine show, and all these high school teenagers showed up from all over Sacramento, California, and they chose four of us to host the show, two boys and two girls. And of the two girls, I was kind of the perky smart one and the other girl was the pretty one.