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Engineer Jem Stansfield looks back through the Horizon archives to find out how scientists have come to understand and manipulate the materials that built the modern world. Whether it is uncovering new materials or finding fresh uses for those man has known about for centuries, each breakthrough offers a tantalising glimpse of the holy grail of materials science - a substance that is cheap to produce and has the potential to change the world. Jem explores how a series of extraordinary advances has done just that - from superconductors to the silicon revolution.