Also known as the “Great Race of Mercy,” the 1925 serum run to Nome saw 20 mushers and about 150 sled dogs relay diphtheria antitoxin 674 miles by dog sled across Alaska in 5 1/2 days, saving the small city and surrounding communities from an incipient epidemic. The life-saving effort made newspaper and radio headlines across the country and is remembered each March with the running of the Iditarod from Anchorage to Nome.