Shailene Woodley

I was always the frugal kid growing up because I was saving for college. Or I was always that kid that was like, 'I'm going to save my babysitting money so I can eat an expensive dinner when I go to Europe.'

I went to public school my whole life, graduated high school with my class. Growing up, I'd go to an audition, my friends would go to soccer practice and we'd all reconvene and hang out in our neighborhood. When I would book something, I would never tell my friends. Acting was just fun. I was a kid, I wasn't jaded.

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.