In this book, we will naturally be dealing primarily with the manifestations of the third level of immunity. I gather material on the biography of Homo immunologicus, guided by the assumption that this is where to find the stuff from which the forms of anthropotechnics are made. By this I mean the methods of mental and physical practising by which humans from the most diverse cultures have attempted to optimize their cosmic and immunological status in the face of vague risks of living and acute certainties of death. Only when these procedures have been grasped in a broad tableau of human 'work on oneself' can we evaluate the newest experiments in genetic engineering, to which, in the current debate, many have reduced the term 'anthropotechnics', reintroduced in 1997.