An (Open) Source of Endorphins

Somewhat belatedly, scientists are localising the physical basis for the kind of altruism that lies at the heart of the opens:

They found that the part of the brain that was active when a person donated happened to be the brain's reward centre—the mesolimbic pathway, to give it its proper name—responsible for doling out the dopamine-mediated euphoria associated with sex, money, food and drugs. Thus the warm glow that accompanies charitable giving has a physiological basis.

Via Technocrat.