Every mode of transport that we use - whether it's planes, trains, automobiles, bikes, horses - is reusable, but not rockets. So we must solve this problem in order to become a space-faring civilization.

With artificial intelligence we are summoning the demon.

Selling an electric sports car creates an opportunity to fundamentally change the way America drives.

Self-driving cars are the natural extension of active safety and obviously something we should do.

I hate writing about personal stuff. I don't have a Facebook page. I don't use my Twitter account. I am familiar with both, but I don't use them.

It's obviously tricky to convert cellulose to a useful biofuel. I think actually the most efficient way to use cellulose is to burn it in a co-generation power plant. That will yield the most energy and that is something you can do today.

You have to be pretty driven to make it happen. Otherwise, you will just make yourself miserable.