Religion is the most malevolent of all mind viruses.

I would defend the liberty of consenting adult creationists to practice whatever intellectual perversions they like in the privacy of their own homes; but it is also necessary to protect the young and innocent.

One of the biggest roles of science fiction is to prepare people to accept the future without pain and to encourage a flexibility of the mind. Politicians should read science fiction, not westerns and detective stories.

In the long run, there are no secrets. in science. The universe will not cooperate in a cover-up.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

Before the current decade ends, fee-paying passengers will be experiencing suborbital flights aboard privately funded vehicles. . . . It won't be too long before bright young men and women set their eyes on careers in Earth orbit and say: "I want to work 200 kilometers from home-straight up!"

It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation.