andI feel that I've been quite lucky in the waythat it has gone. I somehow or other always managedto have a good job, and that's very important I might add. To be quite interested in what I was doing. I've never had a period in whichI've said why am I doing this, this is awful work, these people are preventing me from doing what I want. I've had some constraints, but nothing I could dream of complaining about. I never knew the people over here in Berkeley very well.[tape interrupted] What was I saying? BERGE: You didn't know the people over here in Berkeley very well. KOHN: Oh yes, right. I have only met Lawrence. Well I saw more of Tobias. But his interests in a way were different than mine, I think, because he wastrained as a physicist. BERGE: Can you explain a little bit about the difference in perspectives from a physicist or a radiation physicist and a radiation biologist's point of view? KOHN: I'm not sure that I would want to generalize too much, but I think the physicist would tend to think in terms of his knowledge of atoms, neutrons, protons, so forth, and then when hegets interested in biology, he sees it as a formal, or somewhat more formal problem. (What's making me hesitate here, I'm thinking of another physicist of about the same age as Tobias, perhaps even younger.) Well, I'd say the physicist’s associations would beall with physical and chemical phenomena. The biologist who may know a good deal about physics and chemistry, nonetheless has anotherset of associations dealing with the functioning of the organism as a whole. Now 18