It's not going to be just humans colonizing space, it's going to be life moving out from the Earth, moving it into its kingdom. And the kingdom of life, of course, is going to be the universe.

Most of what we see in the universe is dust.

It's as great a part of the human adventure to invent things as to understand them. John Randall wasn't a great scientist, but he was a great inventor. There's been lots more like him, and it's a shame they don't get Nobel Prizes.

The idea that global warming is the most important problem facing the world is total nonsense and is doing a lot of harm.

So long as you have courage and a sense of humor, it is never too late to start life afresh.

The fact that the climate is getting warmer doesn't scare me at all. There's no reason why one should be scared.

Ethical progress is the only cure for the damage done by scientific progress.