From Russell McLendon and Mother Nature Network:The 2012 Iditarod Trail Sled Dog Race kicks off this weekend, sending 66 dog-powered sleds on a two-week, 1,100-mile slog across Alaska. Dubbed "the Last Great Race on Earth," it's one of the longest, toughest and most popular sled dog races anywhere.Thanks to those same superlatives, though, it's also one of the most controversial.Read More... More on Animals