Sometime in the 1980s when I was on a visit to the United States, a television station wanted to stage a debate between me and a prominent creationist called, I think, Duane P Gish. I telephoned Stephen Gould for advice. He was friendly and decisive: “Don’t do it.” The point is not, he said, whether or not you would “win” the debate. Winning is not what the creationists realistically aspire to. For them, it is sufficient that the debate happens at all. They need the publicity. We don’t. To the gullible public that is their natural constituency, it is enough that their man is seen sharing a platform with a real scientist. “There must be something in creationism, or Dr. So-and-So would not have agreed to debate it on equal terms.” Inevitably, when you turn down the invitation, you will be accused of cowardice or of inability to defend your own beliefs. But that is better than supplying the creationists with what they crave: the oxygen of respectability in the world of real science.