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Could an understanding of biology have prevented the credit crunch? The complex world of banking evolved - and profited - thanks to the work of analytically gifted maths and science graduates. But when the crash came, something new was needed. Now banking regulators are turning to a different kind of science, asking if an understanding of ecosystems or the spread of infectious disease could help reform world finance. Ehsan Masood examines the role of science in the City. Producer Monise Durrani.