Solutions come through evolution. They come through asking the right questions, because the answers pre-exist. It is the questions that we must define and discover. You don't invent the answer-you reveal the answer.

When I worked on the polio vaccine, I had a theory. I guided each [experiment] by imagining myself in the phenomenon in which I was interested. The intuitive realm . . . the realm of the imagination guides my thinking.

Find the right questions. You don't invent the answers, you reveal the answers.

I'm saying that we should trust our intuition. I believe that the principles of universal evolution are revealed to us through intuition. And I think that if we combine our intuition and our reason, we can respond in an evolutionary sound way to our problems.

Are we being good ancestors?

The worst tragedy that could have befallen me was my success. I knew right away that I was through - cast out.

When you inoculate children with a polio vaccine, you don't sleep well for two or three months.