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An embryonic stem cell has been shown to reprogramme a mature skin cell – could this advance help avoid current ethical issues around stem cell research? Better long-range weather forecasts could increase crop yields in Africa by 10%. How global warming might effect tortise reproduction in southern Africa. East Asians and north Americans literally see the world differently, say researchers who used eye-tracking to analyse how the two groups looked at images. Plus, the area of the brain responsible for "change blindness".