Satisfaction of one's curiosity is one of the greatest sources of happiness in life.

In teaching, you do not want to COVER things, you want to UNCOVER them. The best way to get good ideas is to have lots of ideas.

Do not let either the medical authorities or the politicians mislead you. Find out what the facts are, and make your own decisions about how to live a happy life and how to work for a better world.

We may say that life has borrowed from inanimate processes the same basic mechanism used in producing those striking structures that are crystals, with their beautiful plane faces.

[Instead of collecting stamps, he collected dictionaries and encyclopaedias:] Because you can learn more from them.

When an old and distinguished person speaks to you, listen to him carefully and with respect — but do not believe him. Never put your trust into anything but your own intellect. Your elder, no matter whether he has gray hair or has lost his hair, no matter whether he is a Nobel laureate — may be wrong. The world progresses, year by year, century by century, as the members of the younger generation find out what was wrong among the things that their elders said. So you must always be skeptical — always think for yourself.

No evidence compels the conclusion that the minimum required intake of any vitamin comes close to the optimum intake that sustains good health.