On peace and its logic. Evolution, culture, and the possibility of peace. Economic games for the study of peace. Creating shared goals and experiences as a pathway to peace. A neurological foundation for peaceful negotiations. The evolution of peace (and war) is driven by an elementary social interaction mechanism. Capacities for peace, and war, are old and related to Homo construction of worlds and communities. Social and economic interdependence as a basis for peaceful between-group relationships in nonhuman primates and humans. Peace in other primates. Impediments to peace. The importance of social rejection as reputational sanction in fostering peace. Experimental evidence suggests intergroup relations are, by default, neutral rather than aggressive. A game of raids: Expanding on a game theoretical approach utilising the prisoner's dilemma and ethnography in situ. The role of religion in the evolution of peace. Peace is a form of cooperation, and so are the cultural technologies which make peace possible. The intertwined nature of peace and war. Group-structured cultural selection can explain both war and peace. On the evolved psychological mechanisms that make peace and reconciliation between groups possible. Enhanced cooperation increases the capacity for conflict. The psychology of intergroup relations was grounded in intragroup processes. The evolution of (intergroup) peace hinges on how we define groups and peace. Social norms, mentalising, and common knowledge, in making peace and war. Is peace a human phenomenon? Peace as prerequisite rather than consequence of cooperation. Police for peace. Rethinking peace from a bonobo perspective. Cultural technologies for peace may have shaped our social cognition. The roots of peace. Language likely promoted peace before 100,000 ya. How language and agriculture promote culture- and peace-promoting norms. Author's response: The challenge of peace. Integrative experiments require a shared theoretical and methodological basis. The elephant's other legs: What some sciences actually do. Assume a can opener. Test many theories in many ways. There are no shortcuts to theory. Integrative design for thought-experiments. Explore your experimental designs and theories before you exploit them! Confidence in research findings depends on theory. The future of experimental design: Integrative, but is the sample diverse enough? Individual differences do matter. Getting lost in an infinite design space is no solution. Neuroadaptive Bayesian optimisation can allow integrative design spaces at the individual level in the social and behavioural sciences… and beyond. The social sciences needs more than integrative experimental designs: We need better theories. Representative design: A realistic alternative to (systematic) integrative design. Some problems with zooming out as scientific reform. Discovering the unknown unknowns of research cartography with high-throughput natural description. Against naïve induction from experimental data. Beyond integrative experiment design: Systematic experimentation guided by causal discovery AI. Don't let perfect be the enemy of better: In defense of unparameterized megastudies.