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    • Evolution of In-Group Favoritism 

      Fu, Feng; Tarnita, Corina Elena; Christakis, Nicholas Alexander; Wang, Long; Rand, David Gertler; Nowak, Martin A. (Nature Publishing Group, 2012)
      In-group favoritism is a central aspect of human behavior. People often help members of their own group more than members of other groups. Here we propose a mathematical framework for the evolution of in-group favoritism ...