Through more than 50 years of academic research, Richard Lynn has distinguished himself as one of the world's preeminent authorities on intelligence, personality, and human biodiversity. *Race Differences in Intelligence* is his essential work on this most controversial and consequential topic. Covering more than 500 published studies that span 10 population groups, Lynn demonstrates both the validity of innate intelligence as well as its heritability across racial groups. The Second Edition (2015) has been revised and updated to reflect the latest research.