It looks like Zimmerman's theory, that there was not need for a genetic event to explain the great leap forward of humanity in the past 70,000 years, but that just the convergence of two cultural events could do, just received some boost. In Classic Selective Sweeps Were Rare in Recent Human Evolution, by Ryan D. Hernandez, Joanna L. Kelley, Eyal Elyashiv, S. Cord Melton, Adam Auton, Gilean McVean, Guy Sella, and Molly Przeworski (Science 18 February 2011: Vol. 331 no. 6019 pp. 920-924), the authors present that no general genetic event may have occurred in humans in the past 250,000 years.
Bertrand du Castel
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