Intelligence
Richard Lynn and Tatu Vanhanen argue that intelligence should be adopted as a unifying construct for the social sciences, akin to mass, energy, pressure and the like that unify the physical sciences. They show that differences in intelligence between individuals explain numerous phenomena including educational attainment, earnings, crime and health and extend this to the explanation of differences between groups including socio-economic classes, regions within countries and nations. They develop further their work on national IQs for all countries in the world and show that these contribute significantly to the understanding of numerous phenomena in economics, political science, demography, sociology, criminology, anthropology and epidemiology.