If your experiment needs statistics, you ought to have done a better experiment.

Radioactivity is shown to be accompanied by chemical changes in which new types of matter are being continually produced. .... The conclusion is drawn that these chemical changes must be sub-atomic in character.

It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.

We are rather like children, who must take a watch to pieces to see how it works.

The greatest contributor to the feeling of tension and fear of war arose from the power of the bombing aeroplane. If all nations would consent to abolish air bombardment . . . that would mean the greatest possible release from fear.

The more physics you have the less engineering you need.

Don't let me catch anyone talking about the Universe in my department.