The ground of science was littered with the corpses of dead unified theories.

We do not know how much of the environmental change is due to human activities and how much [is due] to long-term natural processes over which we have no control.

Boiled down to one sentence, my message is the unboundedness of life and the unboundedness of human destiny.

I think that what the machines can do, of course, is wonderful, but it's not the same as what the brain can do.

I think it's much better to have your eyes open, but on the other hand, of course it can do harm if you tell people look, there's all these terrible things you can do and then some idiot may go ahead and do it.

It is better to be wrong than to be vague.

Well germ warfare of course exists. There have been on a small scale... There have been, of course, a few people who got killed with anthrax right here in Princeton.