Which data to analyze, and how, are fundamental questions of all empirical research. As
there are always numerous flexibilities in data-analytic decisions (a “garden of forking …

INTRODUCTION Across human societies and in both sexes, some 2 to 10% of individuals
report engaging in sex with same-sex partners, either exclusively or in addition to sex with …

We provide the first analysis and synthesis of the evolutionary and mechanistic bases for risk
of endometriosis in humans, structured around Niko Tinbergen's four questions about …

Background Two recent meta-analyses have suggested the association between digit ratio
(2D: 4D) and aggression is weak. This conclusion has been criticised because the meta …

Knee pain is one of the most common musculoskeletal complaints that brings people to
medical attention. Approximately 50% of individuals over the age of 50 report an experience …

Empathy is a cornerstone of human sociality. It has important consequences for our
interpersonal relationships and for navigating our social world more generally. Although …

Previously reported associations between second-to-fourth digit length ratio (2D: 4D), a
proxy for prenatal androgen load, and transgender identity have been inconsistent. The …

In the last few years, several studies have questioned the value of the second-to-fourth digit
ratio (2D: 4D) as a measure of exposure to sex hormones before birth. Controversy has also …

Aberrant connectivity of large-scale brain networks has been observed among individuals
with alcohol use disorders (AUDs) as well as in those at risk, suggesting deficits in neural …

The relationships of digit ratio (2D: 4D) with the length of AR (CAG) n, and testosterone
levels from saliva and blood have been extensively debated over the years. This research …