Ever since 1928, when a physicist called Paul Dirac predicted an antiworld identical to our own, antimatter has been the subject of intense scientific investigation. Scientists hope that a new antimatter factory recently opened in Switzerland will lead to further breakthroughs. Quentin Cooper talks to Rolf Landua from Cern (the European Organisation for Nuclear Research) and Dr John Fryfrom Liverpool University about Cern's antiproton decelerator. What is antimatter and what should we make of new thinking which suggests that it may not be a complete mirror image of ordinary matter? Producer John Watkins. E-MAIL: material.world@bbc.co.uk
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