On the face of it, and as Darwin himself seems to have noticed, evolution appears to be incompatible with morality. Natural selection inevitably favors organisms which behave in self-serving manners, for it will be these organisms who leave the most descendants. In contrast, altruistic organisms, animals (for instance) which behave in ways which benefit others at some cost to themselves, will leave fewer offspring. Eventually, we might expect, such altruism will go extinct.