Vast ills have followed a belief in certainty.

Unsolved problems, that's one of the great signs of progress in my opinion.

Evolutionary theory tends to explain quite well in retrospect how various species emerged. It's not very good on prediction. Nevertheless, one cannot say that there isn't a lot of knowledge that's been obtained in this field. In the same way, with these complex physical phenomena between solid state physics, you can say a lot of things without necessarily knowing the next step.

I think one of the things we learned from the physicists and also the theoretical biologists is the idea that when you're dealing with very complex systems you're going to get a large variety of behavior which can be interpreted as hill climbing, but hill climbing with a lot of modifications, hill climbing with big jumps occasionally.

My graduate study was interrupted, like that of many others, by World War II.

Now virtue may not always be its own reward, but in any case it is not usually bought and paid for at market rates.

I think that systems that are based on employment are illogical and attempts to meet them create all sorts of unnecessary complexities.