Before revision: Frans de Waal's first book in 1982, Chimpanzee Politics, suggested that the brains of non-human primates like chimpanzees enabled them to engage in the strategic manipulation of others .
After revision: Frans de Waal's first book in 1982, Chimpanzee Politics, suggested that the brains of non-human primates like chimpanzees enabled them to engage in complex and elaborate societal maneuvers .