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More cool experimental evidence that sorting of cooperators fosters cooperation in @PNASNews pnas.org/content/116/12… via @bharedogguy @jayvanbavel 1/
In a 2014 experiment with @DG_Rand & @DrMANowak in @PNASNews, in a different situation, we found the emergence of cooperation clusters. pnas.org/content/111/48… 2/ 
And in observational work mapping social networks among the Hadza and eliciting their cooperative types, with @corenapicella in @nature in 2012, we showed cluttering of cooperative types. nature.com/articles/natur… 3/
In a wonderful follow-up paper published in 2018, @corenapicella and colleagues showed that: Hunter-Gatherers Maintain Assortativity in Cooperation despite High Levels of Residential Change and Mixing sciencedirect.com/science/articl… 4/
