Sparks fly as robots work on frames on the assembly line where the 2008 Ford Expedition and Lincoln Navigator's are produced at the Michigan Truck Plant in Wayne, Michigan August 26, 2008. Ford Motor Co plans to invest $75 million to retool a Michigan truck plant to build cars as part of its effort to boost its product line-up with more fuel-efficient vehicles, the automaker said on Tuesday.
REUTERS/Rebecca Cook (UNITED STATES)