The main ring of the Tevatron, seen in a time exposure. For a quarter century, the particle accelerator at a lab outside Chicago was the most powerful machine of its kind in the world. Reidar Hahn/Fermilab hide caption

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Tevatron Machine Will Smash Particles No More

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This picture of the Eros asteroid is the first of an asteroid taken from an orbiting spacecraft. The crater at the center is about 4 miles across. JPL/JHUAPL/NASA hide caption

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Asteroids Pose Less Risk To Earth Than Thought

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Health Officials: Listeria Outbreak Kills 13

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This artist's conceptual image shows the Upper Atmosphere Research Satellite, or UARS. After two decades in orbit, the satellite will make an uncontrolled re-entry into the Earth's atmosphere. NASA hide caption

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Where Falling Satellite Lands Is Anyone's Guess

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A view inside the Tevatron ring, currently in its final days as a particle superhighway. Reider Hahn/Fermilab hide caption

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A Final Smash For America's Giant Particle Collider

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Two polar bears spar on the shoreline of the Hudson Bay in November 2007. Paul J. Richards/AFP/Getty Images hide caption

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Russian Rocket Fails En Route To Space Station

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"Shrimp on a treadmill" has become a euphemism for questionable government spending on scientific research. The actual research study was focused on how water quality affects a shrimp's performance. Lou Burnett/College of Charleston hide caption

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'Shrimp On A Treadmill': The Politics Of 'Silly' Studies

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A look inside the Dark Energy Camera shows the 74 blue-tinged sensors that detect light. The camera will survey distant, faint galaxies to learn more about dark energy. Reidar Hahn/Fermilab hide caption

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Giant Camera Will Hunt For Signs Of Dark Energy

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A polar bear researcher was suspended from his government job last month over allegations of federal contract mismanagement. Above, a polar bear on fresh ice in the Hudson Bay in November 2007. Paul J. Richards/AFP/Getty Images hide caption

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A wildlife biologist was flying over the Arctic on a routine whale survey when his team spotted dead polar bears in the water. The researcher's report on the observations raised public alarm about the threat of climate change, he's now under an official investigation. Above, a polar bear walks on the frozen tundra on the edge of Hudson Bay on Nov. 14, 2007. Paul J. Richards/AFP/Getty Images hide caption

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Polar Bear Scientist Faces New Questions

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This artist's illustration shows a collision between the moon and a companion moon. Scientists say the collision could be responsible for the moon's asymmetric shape. Martin Jutzi and Erik Asphaug/Nature hide caption

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Early Earth May Have Been Orbited By Two Moons

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