Bouncing Bombs and Blacksmiths - Naked Scientists 11.07.10

This week, we bring you the best bits of technology from the world of engineering including a guiding light into the workings of a retroreflector, the dual life of bi-stable structures, and a new way to harness energy from our rivers. Plus, we unearth the workings of a copper mine, discover how Barnes Wallis designed his famous bouncing bomb and bring you an atomic insight into the art of metalworking!