There seems no limit to research, for as been truly said, the more the sphere of knowledge grows, the larger becomes the surface of contact with the unknown.

But beyond the bright searchlights of science, Out of sight of the windows of sense, Old riddles still bid us defiance, Old questions of Why and of Whence.

Great discoveries are made accidentally less often than the populace likes to think. Commenting on how an accident led to the discovery of X-rays.

The fundamental concepts of physical science, it is now understood, are abstractions, framed by our mind, so as to bring order to an apparent chaos of phenomena.

Most men judge your importance in their lives by how much you can hurt them, not by how happy you can make them.

Freedom requires effort if it is to be won and vigilance if it is to be maintained. People just don't value freedom until it is taken away.

Tomorrow is the only day in the year that appeals to a lazy man.

Introverts are more effective leaders of proactive employees. When you have a creative, energetic work force, an introvert is going to draw out that energy better.

When discussing complex systems like brains and other societies, it is easy to oversimplify: I call this Occam's lobotomy.

Without a reader, I cannot write. It's like a kiss: they cannot be done alone.

The greatest attribute of heaven is mercy; And 'tis the crown of justice, and the glory

We had been frightened of atomic weapons since 1945. In those days I became convinced - and remain convinced now - that, after Hitler, Truman was the greatest murderer in the world.

To have acquired wealth is with many not to end but to change the nature of their troubles.