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.

I think most of the important stuff on the Internet has been built. There will be continued innovation, for sure, but the great problems of the Internet have essentially been solved.

Physics is a good framework for thinking. ... Boil things down to their fundamental truths and reason up from there.

The future of humanity is going to bifurcate in two directions: Either it's going to become multiplanetary, or it's going to remain confined to one planet and eventually there's going to be an extinction event.

Many things are improbable, only a few are impossible.

I would like to fly in space. Absolutely. That would be cool. I used to just do personally risky things, but now I've got kids and responsibilities, so I can't be my own test pilot. That wouldn't be a good idea. But I definitely want to fly as soon as it's a sensible thing to do.

That's my lesson for taking a vacation: vacation will kill you.