To understand transmission of knowledge and its impact on human evolution history, this study explores the research question: "How do hunter-gatherer children learn subsistence skills?". The authors use meta-ethnography methods on 34 cultures from five continents discussing these topics. The results show that the learning process starts early in infancy when their parents take them to the excursions. In middle childhood, they already acquired gathering skills. Only in the start of adolescence, adults begin teaching how to hunt and to produce complex tools. The learning process continues into adulthood.

Schlegel and Barry explore the conditions under which adolescent boys' initiation ceremonies involve rituals that frighten or cause pain to the initiates. The authors look for cross-cultural differences and similarities in cultural features associated with harsh rituals, in particular, genital operations.

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 article tests the general hypothesis that frequency of violent crimes by individuals is related to high concentrations of wealth.

To understand transmission of knowledge and its impact on human evolution history, this study explores the research question: "How do hunter-gatherer children learn subsistence skills?". The authors use meta-ethnography methods on 34 cultures from five continents discussing these topics. The results show that the learning process starts early in infancy when their parents take them to the excursions. In middle childhood, they already acquired gathering skills. Only in the start of adolescence, adults begin teaching how to hunt and to produce complex tools. The learning process continues into adulthood.

Causal factors to the development of crime are examined. Frequency of theft and personal crime are tested against these causal factors in a search for correlations.

This article tests the general hypothesis that frequency of violent crimes by individuals is related to high concentrations of wealth.

This article tests the general hypothesis that frequency of violent crimes by individuals is related to high concentrations of wealth.

This article tests the general hypothesis that frequency of violent crimes by individuals is related to high concentrations of wealth.

This study examines the relationship between infant stress and early menarche. Empirical analysis suggests that stress in infancy, such as mother-infant separation and head-shaping, are associated with early menarche.