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Astronomy: Fossilized rivers suggest warm, wet ancient Mars
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UK: Roman temple dig under way at Keynsham cemetery
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North America: Site with clues to fate of fabled Lost Colony may be saved
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Polynesia: Forensic analysis of pigtails to help identify original 'mutineers of H.M.S. Bounty'
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Natural Heritage: Fate of turtles, tortoises affected more by habitat than temperature
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Rainforests: Logged rainforests can be an 'ark' for mammals, extensive study shows