Scandinavia was populated by two main migrations, making its first inhabitants more genetically diverse and adapted to harsh climates than those in the rest of Europe.
Archaeology is not only about stones and bones: it is mainly about the people of the past. DNA is one way to get from the stones and the bones to the people and their stories.
These massacres entail killing on a relative scale seen today only in the most war-torn countries.
New discovery is evidence of trade with continental Europe.