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Baltimore Gas & Electric lineman Jim Thompson repairs a power line that was damaged by a tree limb in Towson, Md., Monday, Dec. 9, 2013, after a winter storm dumped a mix of snow, freezing rain and sleet on the Mid-Atlantic region. (AP Photo/Steve Ruark)
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The Mars rover Curiosity, pictured here in a self-portrait, has uncovered signs of an ancient freshwater lake on the red planet that may have teemed with microbes for tens of millions of years, far longer than scientists had imagined, new research suggests. (AP Photo/NASA)
