Many species reciprocate, but only humans gossip, and much of what we gossip about is the vale of other people as partners for reciprocal relationships.

science is a smorgasbord, and google will guide you to the study that's right for you.

Sacredness binds people together, and then blinds them to the arbitrariness of the practice.

Our moral sense really evolved to bind groups together into teams that can cooperate in order to compete with other teams.

It only takes twenty generations of selective breeding to create large differences or appearance and behavior in other mammals.

Intuitions come first, strategic reasoning second.

Reciprocity is a deep instinct; it is the basic currency of social life.