The article examines whether cultural groups tend to use supernatural beliefs more to explain natural phenomena or social phenomena. Analysis of ethnographic text from 114 diverse societies reveals that supernatural explanations are more common for natural phenomena, consistent with the theory that humans tend to perceive intent and agency in the natural world. However, supernatural explanations of social phenomena were more prevalent in urbanized societies with greater social complexity and anonymity. The study highlights how people use supernatural beliefs to explain their world and how this varies across small-scale and urbanized communities.

This study sampled over 4,012 language varieties, comparing their version of 40 generally universal words, such as body parts, water, the sun, pronouns, and common behaviors or animals. These language variations were tested in their association to "specific humidity," the variable used to represent ambient humidity of a language location. Results suggest negative association between the dryness of climate and the utilization of vowels, consitent with the idea that dry air affects the behavior of the larynx.

Using a sample of 11,538 mothers from 40 countries, this study explores the instances when maternal burnout increases. The authors suggest two hypotheses: 1) maternal burnout will increase when experiencing inequality in parenting while one holds egalitarian values, and 2) maternal burnout will increase when raising a child in a country with high levels of equality in areas besides parenting. The results support both hypotheses, showing the importance of tackling inequality at the micro and macro levels to decrease maternal burnout. In addition, the analyses show that the cross-level bivariate correlation between countries with high levels of gender equality and holding egalitarian values is positive.

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.

In many nonindustrial socieites, kinship systems are fundamental components for providing certain rules, such as marrrisge and descent, by categorizing them to cultural groups/clans. This study investigates how kinship structures evolve by proposing an agent-based model with empirical cross-cultural analyses. The model simulates competition among societies composed of multiple families, where cultural traits, mate preferences, and patterns of cooperation evolve over successive generations through inheritance and mutation. The simulations showcase the distinct kinship structures, including dual organization, generalized and restricted exchange systems, and patrilineal, matrilineal, and double descent systems, that emerge under these different combinations of cooperative demands and mating competition. After excluding 40 societies that have clan exogamy, the authors then tested these theoretical predictions using data from the Standard Cross-Cultural Sample (SCCS), finding empirical support for the relationships predicted by the model.

In this article researchers created a model to answer the question "What is a typical human life history of foraging skill?" While the immediate goal of this study was to create a model focused on age and relative skill, the larger purpose was to draw more clarity around the trajectory of human foraging skill over time. Researchers used data on hunting returns from 40 different study sites from around the world (Table 1) in order to assess the success of an expedition. While the model created here does not draw conclusions as to the absolute levels of production within or between societies, it can inform cross-cultural comparisons of relative skill at different stages of life. In conclusion, researchers found that the average hunter peaks at 33 years old, and by age 18, has 89% maximum skill (with the range of maximum skill being from ages 24-25). This skill was also found to decline slowly, such that it falls below 89% maximum after age 56. In terms of cross-cultural findings, the model found that cross-cultural variation is evident in the rate at which hunters develop peak skill, (meaning that within sites, the rate at which hunters develop skill is relatively homogeneous compared to the variation that distinguishes young hunters in different study sites), and individual hunters develop physical and cognitive abilities in concert, resulting in high hunting success by their late 20s and early 30s. In order to run the model, this study used the Hamiltonian Monte Carlo algorithm (in the Rstan package) for the sampling, and a Cobb-Douglas production function to express the observable foraging returns.

This study examines possible correlates of the couvade. Results suggest that matri-residence, mother-infant sleeping arrangements, and low male salience all are associated with the couvade.

The author uses a world-wide sample of societies to address variation in famiy organization and the economic and social factors to which it relates.

This study investigates the relationship between cultural complexity and female premarital sexual freedom among foragers. To explain the decline of premarital sexual freedom, the authors discuss a few key trends such as the growth of social control and the decline of female status, as well as other variables such as intensification of foraging, social stratification, accumulation of wealth, political integration, and fixity of settlement. A model relating these variables is presented.

This paper suggests that Fischer's (1961) "male security" variable is not adequate. Cross-cultural analyses suggest that male security in the realm of father-son interaction may be more important than male security in the realm of heterosexual interaction in explaining the line shape preference of a society.