Kindness In A Cruel World

... What do mutual grooming, politeness, priestly celibacy, military heroism, car insurance, and overwork have in common? All are probable examples of the recently discovered evolutionary mechanism called "reciprocal altruism." Put simply, the concept means, "You scratch my back and I'll scratch yours." Although rare in animals, reciprocal altruism colors much of human emotion and social behavior. [click link for full article] ...