^From Russell Trivers on "Reciprocal Altruism". In "Game Theory" this is known as "tit for tat". I think it is an oversimplification of human behavior at best, but i can see how this works amonst animals — and many people. Then again, this is just describing Tit-for-tat or reciprocal altruism – not true altruism, which, in my less cynical moments, I believe humans ARE capable of. -Ken^