The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

It is not good to try to stop knowledge from going forward. Ignorance is never better than knowledge.

It does not say in the Bible that all laws of nature are expressible linearly!

Ignorance is never better than knowledge

I remember my friend Johnny von Neumann used to say, 'with four parameters I can fit an elephant and with five I can make him wiggle his trunk.'

Experimental confirmation of a prediction is merely a measurement. An experiment disproving a prediction is a discovery.

When asked what he meant by a miracle: Oh, anything with a probability of less than 20%.