Formerly, people thought that if matter disappeared from the universe, space and time would remain. Relativity declares that space and time would disappear with matter.

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

All that is valuable in human society depends upon the opportunity for development accorded the individual.

Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.

Racism is America's greatest disease, racism is a disease of the white man.

It is a very grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty. To the contrary, I believe it would be possible to rob even a healthy beast of prey of its voraciousness, if it were possible, with the aid of a whip, to force the beast to devour continuously, even when not hungry.

If the facts don't fit the theory, change the facts.