Unification and the Creation Last of three programmes.
Until recently the question of why the universe exists was thought to be beyond the scope of science. But a few years ago Physicists studying the sub-nuclear constituents of matter stumbled across a surprising connection between their particle theories and the origin of the universe.
Paul Davies , Professor of Theoretical Physics at Newcastle University, examines how far this link between the very small and the very big has gone in unifying the laws of physics and accounting for the cosmic creation.
Producer JULIAN BROWN