Secretary Of Labor Hilda Solis Looks At Batteries That Power The Chevy Volt

Secretary of Labor Hilda Solis looks at batteries that power the Chevy Volt electric plug-in car during a tour of the Detroit Hamtramck Assembly Plant in Detroit, Mich., Feb. 7, 2011. The plant employs 11,000 people. (Official White House Photo by Samantha Appleton)