The first law of dietetics seems to be: if it tastes good, it's bad for you.

I type 90 words per minute on the typewriter; I type 100 words per minute on the word processor. But, of course, I don't keep that up indefinitely - every once in a while I do have to think a few seconds.

They absorb carbon monoxide and carbon dioxide and give out oxygen. What could be more desirable? And they look good in the bargain. Stop chopping down the rain forests and plant more saplings, and we're on our way.

The whole world might know you and acclaim you, but someone in the past, forever unreachable, forever unknowing, spoils it all.

To those who are trained in science, creationism seems a bad dream, a sudden coming back to life of a nightmare, a renewed march of an Army of the Night risen to challenge free thought and enlightenment.

Any book worth banning is a book worth reading.

All roads lead to Trantor, says the old proverb, and that is where all stars end.