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Several major studies, published today, concur that virtually all current global human populations stem from a single wave of expansion out of Africa. Yet one has found 2% of the genome in Papuan populations points to an earlier, separate dispersal event – and an extinct lineage that made it to the islands of Southeast Asia and Oceania.

Best-known for his treatment of shell-shock victims in World War I, a new study examines William Rivers’ crucial, but often overlooked contributions to the study of human culture – revealing how, late in his career, they led him to believe that society as a whole could suffer from “shell-shock”.