I'm in Pittsburgh. Why am I here?

All of us who study the origin of life find that the more we look into it, the more we feel it is too complex to have evolved anywhere. We all believe as an article of faith that life evolved from dead matter on this planet. It is just that life's complexity is so great, it is hard for us to imagine that it did.

[Pure research] is worth every penny it costs.

I'm in Pittsburgh. Why am I here?

Athens built the Acropolis. Corinth was a commercial city, interested in purely materialistic things. Today we admire Athens, visit it, preserve the old temples, yet we hardly ever set foot in Corinth.

Life is not a miracle. It is a natural phenomenon, and can be expected to appear whenever there is a planet whose conditions duplicate those of the earth.

[My study of the universe] leaves little doubt that life has occurred on other planets. I doubt if the human race is the most intelligent form of life.