A woman pulls her son on a snow sled on a street in Belgrade, Serbia, Thursday, Feb. 9, 2012. Serbia is struggling to maintain its power system amid record low temperatures in the

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A woman pulls her son on a snow sled on a street in Belgrade, Serbia, Thursday, Feb. 9, 2012. Serbia is struggling to maintain its power system amid record low temperatures in the Balkan country and much of Europe. (AP Photo/ Marko Drobnjakovic) less