A new model upends old assumptions, revealing more Neanderthal ancestry for both modern Africans and Europeans than once thought.
Some 60,000 years ago, a wave of early humans ventured out of Africa, spreading to every other corner of the world. These travelers were met by a landscape of hominins vastly different from those they left behind. Neanderthals roamed the lands across Europe and the Middle East. Their sister group, the Denisovans, spread through Asia. And whenever these groups met, it seems, they mated.