Most history books still teach that about 5000 years ago mankind was a primitive hunter-gatherer incapable of complex thought. Under this paradigm megalithic structures found all over the world were built for sacrificial purposes, to deify a ruler, or to help a society ignorant of the seasons know when to plant its crops. Mankind was thought to be a brutish sort stuck in survival mode, incapable of little more than grunting and groaning. This myopic view is reinforced by misapplied evolutionary theory that requires that anything that came before us must be more primitive.