Presented by John Maddox
Professor Sir Edward Bullard of the Department of Geodesy and Geophysics at Cambridge University talks about how the Plate theory developed as an explanation of the movement of the continents.
Sir Alan Cottrell looks back at his time as Chief Scientific Adviser to the Government.
Professor Harry Elliot at the Department of Physics, Imperial College of Science and Technology, London University, describes the design of a new space experiment to study high energy X-rays, recently discovered in the solar system.
