We review psychological research on intergroup conflict. First, we outline psychological
perspectives on forms and functions of groups. Second, we present the most influential …

We present evidence that people in small‐scale mobile hunter‐gatherer societies
cooperated in large numbers to produce collective goods. Foragers engaged in large‐scale …

Two major types of aggression, proactive and reactive, are associated with contrasting
expression, eliciting factors, neural pathways, development, and function. The distinction is …

We argue that because of a long history of intergroup conflict and competition, humans
evolved to be tribal creatures. Tribalism is not inherently bad, but it can lead to ideological …

Where did we come from? What is our connection with other life forms? What are the
mechanisms of mind that define what it means to be a human being? Evolutionary …

Evolutionary anthropologists seek to understand the evolution of warfare across multiple
timescales, from the roots of warfare in the intergroup aggression of our primate ancestors …

Highlights•Sexual selection has been stronger in humans than is often assumed.•Ancestral
men competed primarily through force and threat of force.•Ancestral women competed …

Humans are sexually dimorphic: men and women differ in body build and composition,
craniofacial structure, and voice pitch, likely mediated in part by developmental testosterone …

Why is war so closely associated with men? Is it an expression of male nature or a product of
culture? This survey of masculinity and war considers the proposition that men are …

The epic story and ultimate big history of how human society evolved from intimate chimp
communities into the sprawling civilizations of a world-dominating species If a chimpanzee …