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Photoreceptor cell transplants have restored the sight to blind mice, which may lead to future treatment in humans. A total of 457 animals and plants that have had their genome's mapped, the most recent of these is the sea urchin – but why is this spiny creature so important? Developing an iron oxide "sponge" to clean up water contaminated with naturally-occuring arsenic in south-east Asia. Recreating the conditions of Titaln's orange haze in the laboratory could tell us about Earth four billion years ago.