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January 9, 2011

Repair of the components connecting the oxygen and hydrogen tanks in the external fuel tank of the shuttle Discovery, STS-133. Photo: NASA

NASA managers will set a new launch date for Discovery within a week

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The ocean during the Devonian period. Research into the collapse of marine life on Earth 378 to 375 million years ago suggests that Earth's current ecosystem, suffering from a loss of species diversity, may show a similar fate. Image: Museum of Paleontology, University of Michigan.

What causes a mass extinction?

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