Are human beings genetically predisposed to prosocial and cooperative behavior? Are human beings inherently virtuous or evil? Is love self-sacrifice? This book was written to answer these questions from the view point of the neuroendocrinology regulating oxytocin (OXT) system in our brain. OXT is synthesized mainly in a section of brain called -hypothalamus-. While OXT plays a crucial role in childbirth by facilitating uterus contraction and milk ejection, OXT is called as -love hormone- because it also plays a key role in regulating affectionate behaviors. OXT is linked to health- promoting...