Glory days return as Indy revs up for 100th

By Steve Keating INDIANAPOLIS (Reuters) - A rich history and uncertain future will collide at the Indianapolis 500 on Sunday when up to 400,000 motor racing fans descend on the famed Brickyard for a high-octane party over 100 years in the making. After decades of indifference and waning interest, the Indy 500 finds itself back in the motorsport spotlight for the 100th running of what is shamelessly billed as the 'Greatest Spectacle in Racing'. Since Ray Harroun nursed his Marmon Wasp to victory