It used to be taken for granted that it was not only ethically right for scientists to make public their discoveries; it was regarded as their duty to do so. Secrecy, the withholding of information, and the refusal to communicate knowledge were rightly regarded as cardinal sins against the scientific ethos. This is true no more. In recent years it has been argued, more and more vociferously, that scientists should have regard for the social consequences of their discoveries, and of their pronouncements; if these consequences are undesirable, the research in the area involved should be terminated, and the results already achieved should not be publicized. The area which has seen most of this kind of argumentation is of course that concerned with inheritance of intelligence, and with racial differences in ability.