funnily enough, the lack of neolithic culture, social hierarchy, or permanent sedentary lifestyle (all hallmarks of "civilization") and all archeological evidence suggests they were much healthier and more peaceful than neolithic humans. that's why people link "Garden of Eden" mythology originating in ancient Sumeria to the ancient peoples' observation that people became "civilized" but at what cost since it made humans less healthy, more violent, and presumably less happy due to the novel concept of social inequality