Ключевые слова: ancestor, ancient, authentic, breakthrough, cave, caveman, challenge, civilization, creation, creative, day, development, evolution, flint, historic, history, homo, human, indigenous, innovation, inside, invention, male, man, native, natural, nature, neanderthal, prehistoric, prehistory, primeval, progress, rock, sapiens, savage, stone, stone age, success, technology, tools, tribal, tribe, wilderness, work,