We must be careful not to discourage our twelve-year-olds by making them waste the best years of their lives preparing for examinations.

The key to having an interesting life is to always say "yes" to anything crazy.

All stable processes we shall predict. All unstable processes we shall control. Describing John von Neumann's aspiration for the application of computers sufficiently large to solve the problems of meteorology, despite the sensitivity of the weather to small perturbations.

Intelligence may indeed be a benign influence creating isolated groups of philosopher-kings far apart in the heavens... On the other hand, intelligence may be a cancer of purposeless technological exploitation, sweeping across a galaxy as irresistibly as it has swept across our own planet.

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

Science is my territory, but science fiction is the landscape of my dreams.

There are two different ways of looking at the universe; and it's the same universe with two different windows. The science window gives you a view of the world, and the religion window gives you a totally different view. You can't look at both of them at the same time, but they're both true.