New clues suggest slaves were vital to the Viking way of life -- and argue against attempts to soften the raiders' brutish reputation... Archaeologists are using recent finds and analyses of previous discoveries -- from iron collars in Ireland to possible plantation houses in Sweden -- to illuminate the role of slavery in creating and maintaining the Viking way of life. "This was a slave economy," said Neil Price, an archaeologist at Sweden's Uppsala University who spoke at a recent meeting that brought together archaeologists who study slavery and colonization. "Slavery has received hardly any attention in the past 30...