A sweeping genetic analysis is challenging one of the simplest versions of the human origin story: the idea that all modern humans arose from a single ancestral population in Africa. Instead, the research points to a more intricate beginning, with early human groups spread across Africa, mixing for long stretches of time before some of their differences became visible in the DNA of people living today. The study, published in Nature in 2023, compared genetic material from present day African populations with fossil evidence from early Homo sapiens populations. The result was a model of human evolution that replaces a clean family tree with something more like a network of deeply connected branches. A More Complex Beginning in Africa Scientists broadly agree that Homo sapiens originated in Africa. The harder question is how early human groups separated, moved, reconnected, and shaped one another across the continent.…