Using novel approach to study real-time social interactions shows that mutual action visibility facilitates static and dynamic coordination in both species, but whereas humans employ dynamic turn-taking to equalize rewards, macaques, after training with a human, compete between themselves.

Evolutionary game theory identifies reciprocation as a key winning strategy for warring bacteria.

Empathy can evolve and foster cooperation in a game-theoretic analysis of behavior.

A mathematical model for a popular biological diversity mechanism, cyclic dominance, is more likely to emerge by assembly than by evolutionary diversification, which rationalizes why few empirically studies find it.

The two-way coupling between collective actions and risk is essential to avoid the tragedy of the commons.

After playing violent video games for 7 hr over the course of 2 weeks, human male participants show neither signs of decreased empathy for the pain of another person nor of decreased responsivity to violent images.

Humans intranasally administered the neuropeptide oxytocin waste less and earn more spoils during intergroup conflict because oxytocin enables group members to better coordinate strategic attacking of out-groups.

The subjective value of engaging in human social situations, and amygdala and nucleus accumbens activation and their connectivity during social decision-making, vary with social anxiety traits.

Multistability and regime shifts are common and species diversity is high in microbial communities when nutrient supplies are balanced and competing species have different stoichiometries of essential nutrients.

The development of knowledge for a board game facilitates memory for sequences in the game, demonstrating a new mechanism for the facilitation by enabling complicated predictions.