This study analyzed fire use in 93 hunter-gatherer groups based on ethnographic texts from eHRAF in order to improve our understanding of early hominin fire use. The researchers collected data on the groups' methods of making fire, the ways they used fire, and when and where they created fires. The study found that some groups either did not know how to make fire using traditional methods or had very few members who knew how to use such methods. The study also found that many groups preferred to preserve fire rather than create it anew, even carrying it between camps. Beyond this, the ways in which fire was created and used varied widely between hunter-gatherer groups. These findings have implications for understanding early pyrotechnology and the interpretation of the presence or absence of fire residues in the Palaeolithic archaeological record. The results suggest that the absence of fire residues may indicate the absence of fire-making knowledge and skills rather than just taphonomic processes, and that the presence of fire residues does not necessarily indicate the ability to manufacture fire.

The author explicitly defines and provides code for male and female age organizations and secret societies in Africa, as well as their significant sociopolitical roles within society. The author conducts preliminary analysis using the codes to explore characteristics and regional patterns of such organizations and societies. The analysis is compared to existing studies in order to assess the code and better understand cross-cultural patterns and variances. The author identifies the usefulness of the code beyond Africa, and discusses avenues for future research. No explicit hypotheses were tested, but Ericksen includes some descriptive generalizations.

Controlling on a wide range of factors, this article examines the relationship between precolonial systems of leadership succession and contemporary deforestation rates. In a study of areas within the boundaries of 649 precolonial societies, the article finds that areas where local leaders were appointed by social standing were more likely to have poorer institutions governing forest management. The authors emphasize the importance of local governance over forest management and argue that precolonial institutions of leadership still have a bearing on current systems of forest management.

The author evaluates predictions from the standard model of intensification of food production and suggests it be rejected based on an analysis of 40 societies. The standard model proposes that food producers will increase their energy input until the maximum possible output is achieved, at which point output and labor productivity will fall and producers will invent or adopt new technologies. He then proposes a different model, which he terms the cultural niche construction model. The cultural niche construction model proposes that societies will minimize their energy input while maximizing their returns through continual technological adaptation and niche construction. After predictions from this second model are tested, the author suggests tentatively accepting the cultural niche construction model as a new framework to explain transitions to complex societies.

This book investigates the conditions necessary for the success of slavery as an industrial system. Findings indicate that free land and subsistence dependent on capital are necessary for the existence of slavery.

The authors use ethnographic data to try to shed light on the prevalence of missing phalanges in Upper Paleolithic cave images. Searching eHRAF World Cultures, they found evidence of finger amputation in 121 societies. These accounts cast doubt on two common theories: 1) that cave images reflect sign language or 2) counting systems. Researchers argue the intentional removal of fingers could be sorted into the 10 following categories: sacrifice (for deities), mourning (for grief), identity (for group membership), medical (to heal sickness), marriage (status marker), punishment (for deeds), veneration (for worship), offering (post mortem for deities), trophy (an enemies fingers), and talisman (assist with magic). They argue that sacrifice was the most likely reason for the missing finger images in Upper Paleolithic caves.

This paper examines the influence of traditional leaders, or "chiefs," in sub-Saharan Africa, and how their power varies within and among 19 African countries. The authors argue that the power of traditional chiefs is influenced not only by state policies of indirect rule, as previous research has suggested, but also by local factors such as land quality. They find that traditional chiefs have more power in areas with higher agricultural potential and land quality, likely because citizens in these areas rely on traditional chiefs to define and defend their land rights beyond the protections provided by state institutions. The authors suggest that while land quality may not have been an important factor in state formation in the pre-colonial period, it has become increasingly important in the past half century as population densities have increased and agriculture has become more intensive. Controls are also introduced.

This paper examines diverging devolution—the transmission of property to both males and females—and its predictors and consequences. Particular attention is paid to kinship terminology and control of women’s marriage. Multiple hypotheses are supported.

This paper examines the relationship of productive variation in land between ethnic groups to determine if an increased range of producible goods will increase trade, thus decreasing language diversity between neighboring groups. The author initially found that high-variation in land production lessened the diversity of language between ethnic groups in that area. To further test this correlation, the author found that high-productive variation increased trade and exogamous marriage and decreased inter-ethnic conflict. Based on these findings, the author suggests that neighboring ethnic languages co-evolved through the economic benefit of inter-ethnic trade and social interaction.

It has long been suggested among linguists that geographic boundaries between dialect communities correlate with ecological, environmental and even infrastructure-related boundaries on the landscape. This article tests that hypothesis quantitatively, using a suite of spatial statistics to test for autocorrelation between environmental factors within a series of dialect regions throughout Colombia. The authors find that several variables (including precipitation, agroclimatic suitability and access to roads) show significant spatial dependence within dialect regions.