It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will.

Persistence is very important. You should not give up unless you are forced to give up.

Boeing just took $20 billion and 10 years to improve the efficiency of their planes by 10 percent. That's pretty lame. I have a design in mind for a vertical liftoff supersonic jet that would be a really big improvement.

Starting and growing a business is as much about the innovation, drive and determination of the people who do it as it is about the product they sell.

I don't create companies for the sake of creating companies, but to get things done.

Great companies are built on great products.

I think there are too many smart people pursuing internet stuff, finance, and law. That is part of the reason why we haven't seen as much innovation.