Mushers can bring up to 20 dogs to the Iditarod but can start the race with only 16. In the days before the competition, the animals are taken to the Iditarod headquarters in Wasilla, Alaska, for pre-race exams. Russell Lewis/NPR hide caption

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Pete Rose holds the record for all-time hits, but he was banned from baseball in 1989 for gambling on the game. Now, his records — but not his name — appear on Topps baseball cards. Otto Greule Jr/Getty Images hide caption

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Jimmie Johnson celebrates in victory lane after winning the NASCAR Sprint Cup Series Daytona 500 at Daytona International Speedway on Sunday in Daytona Beach, Fla. Chris Graythen/Getty Images hide caption

itoggle caption Chris Graythen/Getty Images