East Asia today harbors more than a fifth of the world's population and some of the most deeply branching modern human lineages outside of Africa. The archaeological record attests that this region was also one of the earliest centers of animal and plant domestication. However, its genetic diversity and deep population history remain poorly understood relative to many other parts of the world. In a new study, a team of international researchers analyzes genome-wide data for 166 ancient individuals spanning 8,000 years and 46 present-day groups, and provides insights into the formation of East Asian populations.