General Motors said Sunday it stands by its Super Bowl ad that plays on the Mayan calendar's predicted 2012 end of the world in which survival depends on driving a Chevrolet Silverado. The ad, which can be seen at www.youtube.com/Chevrolet or by scrolling to the bottom of this

article, ran during the first quarter of the Super Bowl, one of five Chevy spots.......(Read entire article on source site)