“‘How could any man in our village claim that his family had been poor for three generations? If a man is poor, then his son can’t afford to marry; and if his son can’t marry, there can’t be a third generation” China’s poor were continually removed from the gene pool, their places taken by downwardly... Read More

Children making pillow lace for a home workshop. Germany, 1847. During the early stages of Europe’s market economy, successful entrepreneurs would expand their workforce by having more children. There are several obstacles to our understanding of geographic variation in human mental performance. First, the subject is taboo. When people do discuss it, they often resort... Read More