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The Seti (search for extraterrestrial intelligence) project uses screen-savers downloaded by four million home computers to process the massive amount of data collected the world's biggest telescopes. The first artificial brain implant imitating action of the hippocampus will start animal trials with a view to helping humans with brain damage or disease. The scientific reasons behind altruism and co-operative behaviour. Palaeoclimatologists propose a new theory about why Mayan cities were wiped out.