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Richard Dawkins, the author of Selfish Genes, once wrote a classic in the field of behavior, The Evolution of Cooperation. Taking two rounds of repeated prisoner's dilemma competition as the research object, the author finds that even though computer algorithms invent seemingly smarter and more complicated strategies, they are still not as good as the "answer blows with blows" strategy that human beings have always adopted. Recently, Ziff of Harvard University

Williams' research group published an interesting paper, using macaques as experimental objects to reproduce the essence of game theory.