Frederick W. Smith

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 didn't leave home until 27. I was an only child raised in Philadelphia by my mother and grandmother. My grandmother controlled the stove. She made a lot of potato meals - mashed potato, potato souffle, potato pancakes. When we didn't have electricity, we ate romantically by candlelight.

Flexibility is crucial to my fitness. Incorporating a good warm-up and cool-down into every session decreases my chances of injury. I use both dynamic and static stretching in my training. I've starting doing a few yoga sessions which incorporates muscle strength and flexibility.