The great questions are those an intelligent child asks and, getting no answers, stops asking.

A lecture is much more of a dialogue than many of you probably realize.

We have to get rid of those nuclear weapons.

We've committed many war crimes in Vietnam - but I'll tell you something interesting about that. We were committing war crimes in World War II, before the Nuremberg trials were held and the principle of war crimes was stated.

The important point is that since the origin of life belongs in the category of at-least-once phenomena, time is on its side. However improbable we regard this event, or any of the steps which it involves, given enough time it will almost certainly happen at least once. And for life as we know it, with its capacity for growth and reproduction, once may be enough.

As you lecture, you keep watching the faces, and information keeps coming back to you all the time.

I have lived much of my life among molecules. They are good company.