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The sequencing of genomes from archaic humans, such as Neanderthals and Denisovans, has transformed our understanding of human evolutionary history. These ancient genomes reveal that modern humans did not evolve in isolation but interbred with now-extinct groups, leaving lasting genetic legacies. To date, genomic sequences from 31 archaic human individuals, including four sequenced to high coverage, have provided unprecedented insights into the population structure, social organization, and adaptation of this now-extinct lineages, allowing us to reconstruct our own evolutionary history and the mechanisms that led to modern human success. Diyendo Massilani of Yale University School of Medicine reviews nearly three decades of research on archaic human DNA and what we have learned about how these groups lived, as well as how admixture between different lineages may have contributed both to the extinction of archaic humans and the thriving of modern humans. Ultimately, ancient genomes show...