Gentlemen, we have run out of money. It is time to start thinking.

An alleged scientific discovery has no merit unless it can be explained to a barmaid.

That which is not measurable is not science. That which is not physics is stamp collecting.

You should never bet against anything in science at odds of more than about 10-12 to 1.

I must confess it was very unexpected and I am very startled at my metamorphosis into a chemist.

Now I know what the atom looks like.

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.