Is it just our Western scientific bias to be impressed by accurate prediction, to be impressed by the power to sling rockets around Jupiter to reach Saturn, or intercept and repair the Hubble telescope, to be impressed by logic itself? Well, let’s concede the point and think sociologically, even democratically. Suppose we agree, temporarily, to treat scientific truth as just one truth among many, and lay it alongside all the rival contenders: Trobriand truth, Kikuyu truth, Maori truth, Inuit truth, Navajo truth, Yanomamo truth, !Kung San truth, feminist truth, Islamic truth, Hindu truth. The list is endless — and thereby hangs a revealing observation. In theory, people could switch allegiance from any one “truth” to any other if they decided it had greater merit. On what basis might they do so? Why would one change from, say, Kikuyu truth to Navajo truth? Such merit-driven switches are rare — with one crucially important exception: switches to scientific truth from any of the others. Scientific truth is the only member of this endless list that evidentially convinces converts of its superiority. People are loyal to other belief systems because they were brought up that way, and they have never known anything better. When people are lucky enough to be offered the opportunity to vote with their feet, doctors prosper and shamans decline. Even those who do not, or cannot, avail themselves of a scientific education choose to benefit from technology made possible by the scientific education of others.