Good morning, doctors. I have taken the liberty of removing Windows 95 from my hard drive.

The exploration of the planets is now closer to us in time than the exploration of Africa by Stanley and Livingstone.

Isn't killing people in the name of God a pretty good definition of insanity?

I am an optimist. Anyone interested in the future has to be otherwise he would simply shoot himself.

Human judges can show mercy. But against the laws of nature, there is no appeal.

We have to abandon the idea that schooling is something restricted to youth. How can it be, in a world where half the things a man knows at 20 are no longer true at 40 - and half the things he knows at 40 hadn't been discovered when he was 20?

When I start on a book, I have been thinking about it and making occasional notes for some time... So I have lots of theme, locale, subjects and technical ideas... I don't worry about long periods of not doing anything. I know my subconscious is busy.