Is there a "universal human natural moral system"-a moral system inherent in human nature, resulting from fundamental natural principles and evolutionary processes, discernible and explainable via the fast-improving scientific understanding of human behavior and evolution, and which satisfies the basic requirements associated with systems of morality? Is it valid-scientifically and rationally-to acknowledge the existence of the natural moral system and use it to improve human moral understanding? To inform public policy? To help address the shared problems of humanity? To help us live...