"Selfishness beats altruism within groups. Altruistic groups beat selfish groups. Everything else is commentary."

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If you look into their [chimpanzees] eyes, you know you're looking into a thinking mind. They teach us that we are not the only beings with personalities, minds capable of rational thought, altruism and a sense of humor. That leads to new respect for other animals, respect for the environment and respect for all life.

— Jane Goodall