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An incubator jar used by IVF pioneer and Nobel prizewinner Robert Edwards is among items on display in an exhibition to mark 50 years of scientific discovery at a Cambridge college. The exhibition at Churchill College celebrates the achievements of its scientists and engineers since its foundation half a century ago. Other exhibits at Science and Technology at Churchill College: The First 50 Years, which runs until 3 December, include a DNA model signed by the scientist who helped uncover its structure - Francis Crick - who was a Fellow of the college.