There are really two things that have to occur in order for a new technology to be affordable to the mass market. One is you need economies of scale. The other is you need to iterate on the design. You need to go through a few versions.

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.

Design is not just what it looks like and feels like. Design is how it works.

It's really hard to design products by focus groups. A lot of times, people don't know what they want until you show it to them.

The path to the CEO's office should not be through the CFO's office, and it should not be through the marketing department. It needs to be through engineering and design.

I wanted to be able to build things. Actually, in college I built an inkjet printer out of Legos, because I wanted to be able to print really big images. I figured you could print really big posters really cheaply using inkjet cartridges. So I reverse-engineered the cartridge, and I built all the electronics and mechanics to drive it. Just sort of fun projects. I like to be able to do those kinds of things.