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Andrew Marr finds out what science can tell us about the human condition. Ian McEwan's new novel pits climate change against human frailty. Patricia Fara charts 4,000 years of scientific endeavour. Paul Davies, in his search for ET, asks what would it mean if we're not alone in the universe. And journalist James Crabtree talks about how political parties are using the new media techniques of the supermarkets to get our attention in the run-up to the election.