Neil MacGregor focuses on the long tradition of German metalwork, from finely-engineered clocks to the Volkswagen Beetle. German gold and silversmiths were established as the best in the world, but it was for the making of scientific instruments that Germany's workers of the other metals were especially renowned. They worked across a whole range of disciplines at the highest level, combining academic, scientific and practical skills with mathematics and creative artistry. Producer Paul Kobrak.