Episodes of a television program produced by WGBH-TV, Boston. The producer-director was David Walker and the executive producer Lawrence Kreshkoff. Dr. Phillipe Le Corbeiller, Professor of Applied Physics and of General Education at Harvard University, is host and program editor. Throughout the series Dr. Le Corbeiller is joined by other scientists including Gerald Holton, I. Bernard Cohen, Leonard Nash, Cecilia Payne-Gaposchkin, Bart Bok, Sanborn C. Brown, Harlow Shapley, Edwin C. Kemble, and Kirtley Mather.