Building one space station for everyone was and is insane: we should have built a dozen.

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.

How much intelligence does it take to sneak up on a leaf?

There is a technical, literary term for those who mistake the opinions and beliefs of characters in a novel for those of the author. The term is 'idiot'.

The human species really could have faced global thermonuclear war. During seventy years of Cold War we grew used to it.

Half of wisdom is learning what to unlearn.

Never be embarrassed or ashamed by anything you choose to write.