What's in Store for Mary T. Barra at General Motors?

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In this handout image provided by General Motors, The first pre-production Chevrolet Volt is on the assembly line at the Detroit-Hamtramck manufacturing plant March 31, 2010 in Detroit, Michigan.
( John F. Martin/General Motors (via Getty Images) )
Produced by Mythili Rao
PRI WNYC