It didn’t happen all at once.
That’s the main message of a new paper published in Science by the Director of the Smithsonian’s Human Origins Program, Rick Potts, and his colleagues Susan Antón, Professor of Anthropology at New York University, and Leslie Aiello, President of the Wenner-Gren Foundation for Anthropological Research.
National Museum of Nature History
By Dr. Briana Pobiner, Human Origins Program, Smithsonian’s National Museum of Natural History