Nothing disturbs me more than the glorification of stupidity.

In more than one respect, the exploring of the Solar System and homesteading other worlds constitutes the beginning, much more than the end, of history.

Books are key to understanding the world and participating in a democratic society.

An organism at war with itself is doomed.

If you are only skeptical, then no new ideas make it through to you.

I'm only a four-dimensional creature. Haven't got a clue how to visualise infinity. Even Einstein hadn't. I know because I asked him

We can't help it. Life looks for life.