The world's most famous sled dog race is longer than ever. Here's a look at Iditarod, by the numbers / Musher's win makes Iditarod history, but Alaska's famous race is marred by 3 sled dog deaths / Seavey now has the most Iditarod wins, but Alaska's historic race is marred by 3 sled dog deaths / 5-time Iditarod champion shoots dead, guts moose during the annual sled dog race / Sled-dog racer forced to kill moose during historic sled race