Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search.

It is perfectly obvious that the whole world is going to hell. The only possible chance that it might not is that we do not attempt to prevent it from doing so.

You can certainly destroy enough of humanity so that only the greatest act of faith can persuade you that what's left will be human.

Truth, not a pet, is man's best friend.

Science is not everything, but science is very beautiful.

'It worked.' (said after witnessing the first atomic detonation).

When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb.