Later today, the leaders of the 2012 Iditarod Trail Sled Dog Race will depart White Mountain for a 77-mile sprint to Nome, Alaska, the final leg of the 975-mile event called "The Last Great Race on Earth". Dallas Seavey, 25, is currently in the lead, poised to become the youngest Iditarod winner ever. An hour behind is Aliy Zirkle, who, if she can catch Seavey, would become the third woman to win the race (the first was Libby Riddles in 1985.) Sixty-six mushers started the race in Anchorage back on March 4, eight have scratched from the race so far, and one has withdrawn because of injuries. The winner will receive a prize of $50,400 and a new truck, with a total purse of $550,000 to be shared by the first 30 finishers. [Updated with photos of this year's winner, Dallas Seavey.]