If we want to go to space with humans, that's for fun not for science. Human adventures in space are just sporting events.

The technologies which have had the most profound effects on human life are usually simple.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.

Climate change is part of the normal order of things, and we know it was happening before humans came.

If you want to have a program for moving out into the universe, you have to think in centuries not in decades.

No matter how far we go into the future, there will always be new things happening, new information coming in, new worlds to explore, a constantly expanding domain of life, consciousness, and memory.

When World War II came along, which was when I was a teenager, we all expected we would have anthrax bombs and this kind of stuff. We thought it would be a biological war. Fortunately it wasn't and, but it's because the danger is still there and by some miracle we escaped all that, so you never can tell what it going to happen, but biology certainly could be even worse than physics and chemistry.