Anything beats an expensive stack of paper.

The brightest minds in our field have been trying to find a definition of science fiction for these past seventy years. The short answer is, science fiction stories are given as possible, not necessarily here and now, but somewhere, sometime.

Half of wisdom is learning what to unlearn.

My problem with new writers is that it takes me five or six years to memorise the right names.

The dinosaurs became extinct because they didn't have a space program.

The Product of Freedom and Security is a constant (F X S = k). Giving up freedom for security is beginning to look naive.

Consider the true picture. Think of myriads of tiny bubbles, very sparsely scattered, rising through a vast black sea. We rule some of the bubbles. Of the waters we know nothing.