You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.

But their intervention makes our acts to serve ever less merely the immediate claims of our instincts.

Insanity: doing the same thing over and over again and expecting different results.

I speak to everyone in the same way, whether he is the garbage man or the president of the university.

My political ideal is democracy. Let every man be respected as an individual and no man idolized.

The whole of science is nothing more than a refinement of everyday thinking.

If you want to find out anything from the theoretical physicists about the methods they use, I advise you to stick closely to one principle: don't listen to their words, fix your attention on their deeds. To him who is a discoverer in this field the products of his imagination appear so necessary and natural that he regards them, and would like to have them regarded by others, not as creations of thought but as given realities.