An asteroid or a supervolcano could certainly destroy us, but we also face risks the dinosaurs never saw: An engineered virus, nuclear war, inadvertent creation of a micro black hole, or some as-yet-unknown technology could spell the end of us.

As a child I would just question things.

It is definitely true that the fundamental enabling technology for electric cars is lithium-ion as a cell chemistry technology. In the absence of that, I don't think it's possible to make an electric car that is competitive with a gasoline car.

I do love email. Wherever possible I try to communicate asynchronously. I'm really good at email.

I think life on Earth must be about more than just solving problems... It's got to be something inspiring, even if it is vicarious.

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

The United States is definitely ahead in culture of innovation. If someone wants to accomplish great things, there is no better place than the U.S.