We've definitely cracked the technology. Now we're just trying to be able to produce the amount of fuels that we need to satisfy our own needs and then other people's needs.

You've got one go in life, so make the most of it.

Publicity is absolutely critical. A good PR story is infinitely more effective than a front page ad.

There are millions of people out there who would love to become astronauts, who'd love to go to space - they'd love to look back at this wonderful world from space. That will be the engine that will enable us then to develop spaceships to transport people around the world at tremendous speeds in an environmentally friendly way.

The jet stream is a very strong force and pushing a balloon into it is like pushing up against a brick wall, but once we got into it, we found that, remarkably, the balloon went whatever speed the wind went.

Business is what concerns us. If you care about something enough to do something about it, you're in business

It's better to say nothing than spend 1,000 words or an hour speech saying nothing. Get to the point.