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Could it be that in the fluctuating climate and vanishing forest, Australopithecines had fewer food opportunities, and adopted passive scavenging to survive. Then the fat from brains & marrow triggered brain growth that allowed for the beginnings of inventive thinking such as precisions in chipping hand axes, and burning tips on sticks to make spears to chase away predators from their own kills? And this new inventive brain laid the foundation for early humans to do more than survive, but to turn their predators into prey, bringing on a new powerful ethos, expansion and colonization?