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Scientific American
October 9, 2010
 
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
       
      
      Scientific American
October 9, 2010