From ancient Chinese firecrackers to medieval alchemy to the anxieties of the nuclear age, this program looks at a variety of explosive materials and shows how we have learned to harness their power. British engineer Jem Stansfield demonstrates the inner workings and fiery effects of several different chemical concoctions. He goes underground to show how gunpowder was used in the mines of Cornwall, recreates the first test of guncotton for use in quarrying, visits a modern high explosives factory with a noble history, and even splits an atom with the help of improvised equipment. Groundbreaking high-speed photography makes for some startling revelations that are sure to spark further study. Produced by the Open University. (60 minutes)