Can physiological variation in human populations be attributed to environmental variables? Arguing for the importance of phylogenetic comparative methods, the authors present the results of previous research by Holden & Mace (1997) on lactose intolerance as well as introduce new research on sex ratio at birth. The authors suggest that global variance in sex ratio at birth is an adapted response to the physiological costs of giving birth to boys in high fertility populations.

This book discusses the characteristics of adolescence cross-culturally and examines the differences in the adolescent experience for males and females. Several relationships are tested in order to gain an understanding of cross-cultural patterns in adolescence.

This study examines the consequences of birth order; results suggest that the firstborn child is more likely to have social authority as they grow older (they have siblings’ respect, they control property or head kin groups, etc.). The authors suggest that this authority may be legitimated by extra attention firstborns receive though elaborate birth ceremonies and teknonymy.

This book investigates a broad hypothesis linking social solidarity and initiation ceremonies. The author proposes that “the degree of solidarity of a given social system determines the degree to which status transitions within it will be dramatized” (1). A variety of operational hypotheses are supported for both male and female initiation ceremonies.

This article uses factor analysis to identify the key variables underlying the many cross-cultural associations reported by Textor (1967). Twelve factors are identified.

This article analyzes the predictors of private property ownership with an aim to replicate existing correlations using data from the dissertation of Zelman (1974).

This article presents theory and hypothesis tests that suggest that the decline of women's contribution to intensive agriculture is related to increases in fertility and domestic work associated with cereal crops. Additionally, men in agricultural societies are less likely to invest time in hunting and warfare, so their contribution of agricultural labor relative to women's increases.

This paper seeks to understand the roles played by children and adolescents in hunter-gatherer societies in relation to their social and ecological context. The authors set out to investigate how environmental factors, ecological risk, and the energetic contributions of adult men and women to food production may have influenced children/adolescent allocation of time to child care, domestic work, food production, and play. In order to carry out this study, the authors logged the behaviors of 690 children and adolescents from twelve hunter-gatherer and mixed-subsistence societies (Agta, Aka, Baka, BaYaka, Dukha, Hadza, Matsi-genka, Maya, Mayangna, Mikea, Pume, and Tsimane), totaling 85,597 unique observations. The study found that harsh environmental factors were not associated with child/adolescent time allocation, but that local ecological risk such as dangerous animals and lack of water availability predicted decreased time allocation to child care and domestic work, and that increased adult female participation in food production was associated with less time invested in child care among boys. It also found that all gendered differences in time allocation among children were stronger when men made greater contributions to food production than women. The authors interpret these results to signify that parents may play a role in preparing their children for environmental and ecological difficulty in order to help them develop skills that will help them become useful community members as adults.

A study of the relationship between older women and their young female kin. Relationships between women's relationships with their mother-in-laws and subsistence contribution, residence, descent, and food preparation are examined. Findings offer significant support for patterns in the relationship between older women and younger female kin.

This chapter examines the relationship between social cohesion (measured using variables like subsistence type, stable work teams, and settlement patterns) and musical cohesion. All hypotheses are supported.