The computer screen showed a group of zombies on one side and some plants on the other. “What are these zombies doing here?” asked the emperor. “They’re the enemies of the empire.” “What about these weeds and flowers?” “They’re the empire’s most loyal guardians.” Surprisingly, the emperor had a lot of fun—he loved the sight of the corpses of his enemies strewn across the lawn. He did find it rather annoying that he had to wait passively for waves of zombies to approach, instead of actively dispatching

