Detailed plans for an eighteen-month expedition in which a fleet of gigantic nuclear-powered spacecraft will land men on Mars are disclosed by Dr. Ernst Stuhlinger of N.A.S.A., who demonstrates a model of the spacecraft which it is planned to use. Also: Editors in Conference - The Editors of two leading scientific magazines, Dennis Flanagan of the Scientific American, and Nigel Calder of the New Scientist, discuss with Gordon Rattray Taylor the problems of popularising science and placing it in a social context.