Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.

How smart does a chimpanzee have to be before killing him constitutes murder?

It is clear that the nations of the world now can only rise and fall together. It is not a question of one nation winning at the expense of another. We must all help one another or all perish together.

Books are like seeds. They can lie dormant for centuries and then flower in the most unpromising soil.

When we look up at night and view the stars, everything we see is shinning because of distant nuclear fusion.

Modern science has been a voyage into the unknown, with a lesson in humility waiting at every stop. Many passengers would rather have stayed home.

That we can now think of no mechanism for astrology is relevant but unconvincing. No mechanism was known, for example, for continental drift when it was proposed by Wegener. Nevertheless, we see that Wegener was right, and those who objected on the grounds of unavailable mechanism were wrong.