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Together with GIS scientists Curdin Derungs, Martina Köhli and Robert Weibel, Balthasar Bickel published a new study showing that "environmental factors drive language density more in food-producing than in hunter-gatherer populations” in Proceedings of the Royal Society B: Biological Sciences
More: http://rspb.royalsocietypublishing.org/content/285/1885/20172851