Understanding the roots of human cooperation among strangers is of great importance for solving pressing social … dilemmas and maintening public goods in human societies. We study the development of cooperation in 929 young children, aged 3 … to 6. In a unified experimental framework, we examine which of three fundamental pillars of human cooperation − direct …

Political ideology has been hypothesized to be associated with cooperation and national parochialism (i.e., greater … cooperation with members of one’s nation), with liberals thought to have more cooperation with strangers and less national …, cooperation, and national parochialism around the globe. To do so, we recruited 18,411 participants from 42 nations. Participants …