Surprising DNA found in ancient people from southern Europe

Since the beginning of human migration, the Iberian Peninsula—home of modern-day Spain and Portugal—has been a place where the cultures of Africa, Europe, and the Mediterranean have mingled.
In a new paper in the journal Science, a group of 111 population geneticists and archaeologists charted 8,000 years of genetics in the region. They paint a picture that shows plenty of genetic complexity, but that also hints at a single mysterious migration about 4,500 years ago that completely shook up ancient Iberians’ DNA.