Beginning with a new essay, "Levels of Life and Death," Tibor G?nti develops three general arguments about the nature of life. In "The Nature of the Living State," Professor G?nti answers Francis Crick's puzzles about "life itself," offering a set of reflections on the parameters of the problems to be solved in origins of life research and, more broadly, in the search for principles governing the living state in general. "The Principle of Life" describes...