Twenty-first century scientists want to find out how the universe came to be like it is. Their experiments involve a metaphorical journey back in time to within a billionth of a second of the Big Bang and constitute the latest stage in the quest to understand the matter that makes up our Universe and the forces that govern it. Close takes us on en exhilarating tour of the subatomic world, illustrated with beautiful photographs of the tracks of subatomic particles as they speed, curve, dance or explode through cloud and bubble chambers.