Legally required water systems at Massey Energy's Upper Big Branch coal mine in West Virginia were not functioning properly before the April 5 explosion that killed 29 mineworkers, according to multiple sources familiar with the disaster investigation.
Some mine safety experts believe that these safety systems might have helped prevent the explosion if they had been working as designed.
States in the South and West gained residents — and political clout — at the expense of the Midwest and East, according to new census figures that will change the nation's political makeup.
The 2010 Census Bureau report, released Tuesday, officially put the U.S. population at 308.7 million, reflecting the lowest growth since the Great Depression. Texas and Nevada led the way, reinforcing a decades-long shift away from the traditional manufacturing belt and toward warmer regions of the country.