In this book, named after the Roman god who faced two ways, the author sums up his work over the past twenty-five years and indicates its continuity since he turned from politics to the sciences of life He shows us man as a dual-faceted unique individual, who is yet part of a social group Order comes when these two are in balance The difference between this post-atomic world and the preceeding centuries is our ability to cause death, not just individually but as a species