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GOLD IN THE STARS

How was gold formed? University of Glasgow astrophysicist and ‘black hole hunter’ Prof. Martin Hendry goes on a journey through space and time to seek an answer, and explores how the detection of spacetime ripples from colliding neutron stars has brought exciting new insights into the cosmic origins of precious metals.

TO BUILD IN ORKNEY’S EARTH AND STONE

Earth has been used as building material in Orkney since the Neolithic.  Architect Tom Morton and mudmason/artist Rebecca Little have been studying its use in Orkney’s ancient buildings for Historic Environment Scotland, and they’ve identified a range of skilled techniques. Earth can bind stones for walls, and clay was used to seal roof slates at the Ness of Brodgar. Recent studies have highlighted its use as decorative plaster. And as they explain, in today's climate situation, local materials like earth and straw could have a role again.

GREEN CHEMISTRY

Green chemistry seeks ways to transform waste or renewable natural materials, and make safe chemicals and recyclable products. Prof. James Clark of the University of York’s Green Chemistry Centre describes examples that include cleaning products from sawdust and food wastes, fuels from waste cooking oils, medical devices from seaweed, and clothes from pineapple leaves.

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