The emerging discipline of evolutionary medicine is breaking new ground in understanding
why people become ill. However, the value of evolutionary analyses of human physiology …

In the Samoan language, fa'afafine means:“in the manner of a woman.” Like Samoan men,
fa'afafine are biological males. However, fa'afafine do not identify as men nor do the …

Past research found that environmental uncertainty leads people to behave differently
depending on their childhood environment. For example, economic uncertainty leads …

Mental disorders arise from neural and psychological mechanisms that have been built and
shaped by natural selection across our evolutionary history. Looking at psychopathology …

The use of sacred values by humans to enforce cooperation has been seen throughout
human history, as demonstrated by philosophers like Marx and Aristotle observing that …

China's three-child policy was implemented in May 2021 to stimulate a rise in fertility levels.
However, few previous studies have explored fertility intentions to have a third child and …

Prior research indicates that being reared in stressful environments is associated with earlier
onset of menarche in girls. In this research, we examined (a) whether these effects are …

Evolutionary models of human life-history predict that ecological characteristics drive
variability in reproductive timing by altering anticipated returns to inclusive fitness. Local …

Cultural, ecological, familial and physiological factors consistently influence fertility
behaviours, however, the proximate psychological mechanisms underlying fertility decisions …

Timing of menarche has largely been studied in the context of a secular trend. However,
since mortality and fertility rates are fundamental demographic factors linked to a …