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Chicago running for 2011

San Francisco, Dec. 4: A close-up of the dirty sneakers of a runner while racing during the Gore-Tex 50 Mile Race in The North Face Endurance Challenge. The 50-mile race began in the dark at 5 a.m.
San Francisco, Dec. 4: A close-up of the dirty sneakers of a runner while racing during the Gore-Tex 50 Mile Race in The North Face Endurance Challenge. The 50-mile race began in the dark at 5 a.m.
Photo by Ezra Shaw/Getty Images

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