The U.S. infant mortality rate
The U.S. infant mortality rate, an important measure of a country’s overall health, improved only slightly in 2010, federal researchers report, and remains far worse than that in other wealthy nations — plus a lot of not-so-rich ones: 
 
 
 
          
      
 
  
 
 
 
 
 
 
 
 
 
 
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