My opinion is it's a bridge too far to go to fully autonomous cars.

You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it.

If you had to buy a new plane every time you flew somewhere, it would be incredibly expensive.

I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.

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.

I always invest my own money in the companies that I create. I don't believe in the whole thing of just using other people's money. I don't think that's right. I'm not going to ask other people to invest in something if I'm not prepared to do so myself.

Facebook is quite entrenched and has a network effect. It's hard to break into a network once it's formed.