History. Many learn it, or at least they did. It showed humanity's past. The mistakes, the success the horror and the consequences of their actions. Unfortunately, humanity seemed to never learn, repeating the same mistakes over and over again. Until someone made a really stupid mistake.(ok he was allowed to but still) Every one knew it would happen eventually. Everything ends. Nations rise and fall. Species die out to be replaced by "better ones". Or like humanity an idiot scientest crates a biological agent the resurrects the recently dead. Yep. It fucken happened. The Zombie apocalypse. Well at least I was ready.(Ok I wasn't but my AI insurred I was.)