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A new, comprehensive review of human anthropological and genetic records gives the most up-to-date story of the “Out of Africa” expansion that occurred about 45,000 to 60,000 years ago.

This expansion, detailed by three Stanford geneticists Henn, Cavalli-Sforza, and Feldman presents an up-to-date version of the model. In the recent study is published in this edition of the Proceedings of the National Academy of Sciences they conclude it had a dramatic effect on human genetic diversity, which persists in present-day populations. As a small group of modern humans migrated out of Africa into Eurasia and the Americas, their genetic diversity was substantially reduced.