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The book has a lot of data backing up what he says and he let’s you know when he’s speculating and when there is counter evidence to his ideas. So, I can’t just put up pithy quotes that summarize everything. One quote he uses (I forget the source), to make a point about the difference between us and our primate relatives is, you’ll never see two chimpanzees working together to carry a log. As much as we resemble them with our hierarchical behaviors, we get non-kin to cooperate in ways no other animals do.