In this paper, I examine the relationship between sibling sex composition and educational achievement. First, I replicate the study of Butcher and Case (1994) using data on a more recent birth cohort. Contrary to the findings of that study, I find basically no effect of sibling sex composition...

The Ku Klux Klan reached its heyday in the mid-1920s, claiming millions of members. In this paper, we analyze the 1920s Klan, those who joined it, and the social and political impact that it had. We utilize a wide range of newly discovered data sources including information from Klan membership...

In The Bell Curve Herrnstein and Murray argue that a youth's intelligence (IQ) is a more important determinant of social and economic success in adulthood than is the socioeconomic status (SES) of his or her parents. Herrnstein and Murray base this conclusion on comparison of effects of IQ score...