Computer models of the climate....[are] a very dubious business if you don't have good inputs.

The marketplace judges technologies by their practical effectiveness, by whether they succeed or fail to do the job they are designed to do.

If you go to London now, not everything is beautiful, but it's amazingly better than it was. And the Thames is certainly a lot better: There are fish in the Thames.

It is in the long run essential to the growth of any new and high civilization that small groups of men can escape from their neighbors and from their government, to go and live as they please in the wilderness. A truly isolated, small, and creative society will never again be possible on this planet.

I'm a mathematician, basically. What I do is look around for problems where I can find useful applications for mathematics. All I do, really, is the math, and other people have the ideas.

You could say science also is an art.

Most of what we see in the universe is dust.