Thomas Silk, editor ; foreword by John G. Simon. P.W. Atkins ; foreword by John P. Simons. Susan Gray, editor ; foreword by Paul Goldberger. [by] Thomas Hutchison; with a foreword by John Boyd Orr. by J.S. Marsh ; with a foreword by John Johnston. Theodore C. Sorensen ; foreword by John F. Kennedy. Thomas M. Masters ; with a foreword by Janice M. Lauer. Shimon Y. Nof, editor ; with a foreword by Isaac Asimov.