I realized that a methane-oxygen rocket engine could achieve a specific impulse greater than 380.

I'm personally a moderate and a registered independent, so I'm not strongly Democratic or strongly Republican.

And we need things in life that are exciting and inspiring. It can't just be about solving some awful problem. There have to be reasons to get up in the morning.

What I'm trying to do is to maximise the probability of the future being better.

Funded by the government just means funded by the people. Government, by the way, has no money. It only takes money from the people. Sometimes people forget that that's really what occurs.

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.

We're running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere can handle before there is an environmental catastrophe.