Xiao Yuanshan wore it. On the first day when I traveled to a wasteland planet, I was tied to the altar as a sacrifice. A huntress held a bone knife against his neck, while more than three thousand primitive people in the audience screamed and wanted to stew him. A voice suddenly popped up in his mind: The civilization recovery system has been bound, the current era is Paleolithic, and the host is asked to teach the tribe to drill wood and make fire within three days. Xiao Yuanshan looked at his hands that were unable to press the lighter, then at the Huntress's polished bone knife, and swallowed: "Well... How about we talk about the first chapter of "The Origin of Human Civilization" first?" Later, when his tribe drove an interstellar aircraft carrier to crush Luo Tiecheng's mercenary fleet, everyone still remembered the unlucky teacher who was tied to the stone platform and still giving lessons.