Recent archaeogenetic studies have shown that human migrations and individual mobility played a bigger role in prehistory than previously anticipated. With the movement of people, also culture, technical know-how, language and social practices were often spreading, leading to sometimes fundamental changes in lifestyle and genetic ancestry. By studying 135 individuals from the Copper and Bronze Age in southeastern Europe and the northwestern Black Sea region an international team of researchers documented significant genetic changes between 7000 and 4000 years ago, a time when contact and exchange with late farming groups enabled the economic exploration of the West Eurasian steppe belt.