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

I think we should be very careful about artificial intelligence. If I had to guess at what our biggest existential threat is, it's probably that. So we need to be very careful...With artificial intelligence we're summoning the demon.

If anyone thinks they'd rather be in a different part of history, they're probably not a very good student of history. Life sucked in the old days. People knew very little, and you were likely to die at a young age of some horrible disease. You'd probably have no teeth by now. It would be particularly awful if you were a woman.

The primary means of energy generation is going to solar. It will at least be a plurality, and probably be a slight majority in the long term.

You need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place.

My family fears that the Russians will assassinate me.

The thing that's worth doing is trying to improve our understanding of the world and gain a better appreciation of the universe and not to worry too much about there being no meaning. And, you know, try and enjoy yourself. Because, actually, life's pretty good. It really is.