The historical record knows only few instances of democracies waging war against each other. Therefore, democratization is considered key in achieving global peace. However, efforts to achieve sustained democratic governance often fail-Afghanistan being a recent example. Democratization appears...

The historical record knows only few instances of democracies waging war against each other. Therefore, democratization is considered key in achieving global peace. However, efforts to achieve sustained democratic governance often fail-Afghanistan being a recent example. Democratization appears...

The scale of violent intergroup conflict in humans is astonishingly large compared to other mammals [1, 2, 3, 4]. This capacity for war is closely linked to our exceptionally cooperative abilities [5, 6]. The parochial altruism model formally describes how within-group cooperation and...

We present empirical measures of wealth inequality and its intergenerational transmission among four horticulturalist populations. Wealth is construed broadly as embodied somatic and neural capital, including body size, fertility and cultural knowledge, material capital such as land and...

In many human societies, high male social status associates with higher fertility, but the means by which status increases lifetime fitness have not been systematically investigated. We analyse the pathways by which male status begets reproductive success in a small-scale, Amerindian society....