Barbara Corcoran

If I could set a world record, it would be that I have 150 business partners, all with thriving businesses of their own that started with nothing and I made the difference to make them all billionaires.

I studied psychology for a couple of years as a personal hobby, so you start learning about people and listening to your intuition, like when you you're feeling that people are not being entirely straight with you.

Then, there was Greenpeace, I remember that when they first started out with the boats in the waters, and the guys in the boats between the whales and the boats that will hunting the whales with spear guns.

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.