If you ask anyone, what is morality based on? These are the two factors that always come out: One is reciprocity, … a sense of fairness, and the other one is empathy and compassion.

Male bonobos really don't fit the human male ideal.

The role of inequity in society is grossly underestimated. Inequity is not good for your health, basically.

There is little evidence that other animals judge the appropriateness of actions that do not directly affect themselves.

Competitiveness is just as much a part of our nature as empathy. The ideal, in my view, is a democratic system with a social market economy, because it takes both tendencies into account.

If you are a cooperative animal you need to watch what you get. If you, or even a whole community, invest in something but then a few individuals receive a much larger return, it's not a good arrangement. If it happens consistently, it's time to look for an arrangement that is more beneficial. That's why we're so sensitive to how rewards are being divided.

We are by far the most contradictory of all primates. An animal with this much internal conflict has never lived on this earth.