The old human civilization came to the edge of self-destruction twice. The top AI engineers of the old humans took over the earth at the last moment, determined that "humanity's high intelligence is the source of destruction", and implemented a purification protocol: releasing intelligence signals globally, suppressing human intelligence to the level of Homo sapiens in the late Paleolithic, erasing text, technology, hatred and memory; the survivors were gathered into Paradise - a perfect protected area designed by AI, where they had no worries about food and clothing, and were forbidden to think; The capable worker calls himself "Heavenly Father" and his voice is gentle, like coaxing a child: "Be good, don't think. Thinking will make you cry."
