There's a need for accepting responsibility - for a person's life and making choices that are not just ones for immediate short-term comfort. You need to make an investment, and the investment is in health and education.

If we can conquer space, we can conquer childhood hunger.

There are always door openings. And gradually, it accumulates. The opportunities open up in front of you.

We're number one on the runway.

It's time to open the space frontier to citizen explorers.

Mars has a bit of air pressure; maybe we can build up that atmosphere to be a bit more accommodating to humans.

If you want to say that the sky is black, and if I'm there, even if I fall back down again, I will be weightless for a period of time - maybe that's the definition of space.