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New theory proposes that one extraterrestrial impact could have caused the rapid evolution of large dinosaurs – and another one caused their extinction. Why a new drug under development to treat Alzheimer's disease is targeting amaloid deposits in patients' brains. Interview with Rajendra Pachauri, appointed to replace Robert Watson as the chair of Intergovernmental Panel on Climate Change (IPCC) after the USA pulled out of the Kyoto agreement.
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