A PNAS framework redefines koinophilia—the evolutionary preference for typical or average traits—as a mechanism for addressing modern social fragmentation. The authors propose that humans' innate attraction to commonality and shared characteristics can be leveraged therapeutically to counter rising isolation and political polarization. This represents a fascinating intersection of evolutionary psychology and public health intervention. The koinophilia principle suggests our brains are wired to seek social cohesion through similarity recognition, potentially explaining why diverse societies struggle with fragmentation while offering a biological pathway for healing social divisions. For health-conscious adults, this framework could inform community-building strategies that tap into fundamental human drives rather than fighting against them. The approach may prove particularly relevant for addressing loneliness epidemics and their associated cardiovascular and cognitive health risks. However, the practical application remains theoretical, and there's risk that emphasizing commonality could inadvertently suppress beneficial diversity. The authors' bold claim that evolutionary mechanisms can solve modern social problems deserves empirical testing through controlled community interventions before widespread adoption.