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Space station astronauts embark on spacewalk
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Flaw opens alien program to invaders
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Ariane 5 ready for comeback flight
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Superbright gamma ray burst may be closest ever
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Cluster bomb use sparks fear for Iraqi civilians
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Radar tests point to lost panel on shuttle
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Desktop kit slows light to a crawl
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X-ray effect reveals black hole’s event horizon
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GPS phones confiscated from reporters in Iraq
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Data recorder taped shuttle’s last seconds
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Neanderthals as nimble-fingered as humans
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Iraq weather respite may only be temporary
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