This innovative study focuses on seven inherent personality traits humans share with primates; activity, fearfulness, impulsivity, sociability, altruism, aggressiveness, and dominance. The author discusses these traits from the dual perspective of our evolutionary history and our human uniqueness. Contents: An Evolutionary Perspective. Determinants of Personality. Activity. Fearfulness. Impulsivity. Sociability. Nurturance. Aggressiveness. Dominance. Integration.