These six excellent politico-humanistic reports cover an underground atomic explosion, the Aldershot peace march, the international conferences for the discontinuance of nuclear weapons testing, Jerome Weisner as a person and as presidential science and technology advisor, the Pugwash conferences, and finally offer the author's personal survey among Establishment brass as to what constitutes ""enough"" in our defense weapons build-up. They are original, well-written essays on important and fateful topics. Here clearly is a man of feeling who is deeply concerned with the fate of humanity and how world leaders make the decisions that affect history. He writes objectively but not coldly of the many individuals he has talked with from Russian and English scientists to American politicians and missile-men, letting their own words reveal their wisdom, bias or limitations. Particularly impressive is his last essay, from which the book's title is drawn. Here Secretary McNamara, those in the Pentagon and in other sensitive areas of decision-making for defense answer his ""inquiry."" The diversity of replies is as frightening as his closing description of a silo--a hardened Atlas missile site. Keen insights.