A serious but never inaccessible exchange between two scientists, with WFB acting as catalyst, on the question: Does man have free will? One sample: DM: "I personally wouldn't like to take the optimistic view that anyone who goes in for cruelty as a way of ensuring survival... is bound to-" WFB: "Self-destruct?" DM: "I think it would be nice if that were true, [but] I doubt it." WFB: "When you use the word 'God' you are using a metaphor-or not?" DM: "No, I would take this in the specific Christian religious sense-God as one to be reckoned with." WFB: "Does that make you uncomfortable, Mr. Skinner?" BFS: "No, because when I listen to that sort of thing I'm running a translation inside, of course. I think that the good, personified in a god, does represent those things which we find, to use a technical term, reinforcing. They're the things which induce us to behave in certain ways. And evil? Well, the ordinary Christian picture of hell is a collection of all the aversive stimuli available at the time."