If people would only talk about what they understood, Earth would be a very quiet place.

How insidious Nature is when one is trying to get at it experimentally.

We act as though comfort and luxury were the chief requirements of life. All that we need to make us happy is something to be enthusiastic about.

Often in evolutionary processes a species must adapt to new conditions in order to survive. Today the atomic bomb has altered profoundly the nature of the world as we know it, and the human race consequently finds itself in a new habitat to which it must adapt its thinking.

The thing is, not to stop questioning.

I am doing just fine, considering that I have triumphantly survived Nazism and two wives.

One can't teach a cat not to catch birds