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Is it possible to smash glass purely with the power of the human voice – and if so, how? The ÃÛÑ¿´«Ã½ opera season begins at the end of September and it will be carrying out a range of experiments to look at the science behind opera. Professor of acoustic engineering at the University of Salford Trevor Cox explains why this is possible - and how he plans to demonstrate it. (Image: Broken wine glass. Credit: Getty Images)