We review new findings and new theoretical developments in the field of intelligence. New
findings include the following:(a) Heritability of IQ varies significantly by social class.(b) …

Urban green infrastructure provides a number of cultural ecosystem services that are greatly
appreciated by the public. In order to benefit from these services, actual contact with the …

Fueled by new evidence, there has been renewed interest about the effects of birth order on
human capital accumulation. The underlying causal mechanisms for such effects remain …

We tested birth order associations with personality traits and intelligence using Project
Talent, a representative sample (N= 377,000) of US high school students. Using a between …

Two leading social scientists examine the gender wealth gap in countries with officially
egalitarian property law, showing how legal professionals—wittingly and unwittingly—help …

The rapidly increasing use of sibling comparisons is a welcome development in
epidemiology. Although sibling designs have been used by epidemiologists since the mid …

Birth Order The sequence by which children are born into a family. The most important birth-
order positions are eldest, middle, and youngest. As a rule, birth-order differences in …

According to expectations derived from evolutionary theory, younger siblings are more likely
than older siblings to participate in high-risk activities. The authors test this hypothesis by …

Using sibling data from the German Life History Study and fixed-effects models, I find that
birth order has a strong negative effect on educational attainment in West Germany—being …

First-born children tend to outperform their younger siblings on measures such as cognitive
exams, wages, educational attainment, and employment. Using a framework similar to …