Human Origins Reframed as a Continental Genetic Network

A Nature study shows modern humans likely arose from a network of intermingling African populations rather than a single ancestral group. By analyzing genomes from southern, eastern, and western Africa (including 44 Nama genomes), researchers found the earliest detectable split occurred about 120,000–135,000 years ago, with long, ongoing gene flow among weakly differentiated groups—forming a 'weakly structured stem' rather than a clean family tree. This view alters how fossils are interpreted and is supported by subsequent research highlighting deep African diversity.