but only named in honor of the Chief Commoners who ruled the villages. "How long until the year 6,000?" he asked. Big Joe clucked like an adding machine. "Twelve Marsyears, technologist." Asir stared at the complicated machinery. Could they learn to operate it in twelve years? It seemed impossible. "How can we begin to learn?" he asked the robot. "This is an instruction room, where you may examine records. The control mechanisms are installed in the deepest vault." Asir frowned and walked to the far end of the hall where another door opened into—another anteroom, with another Big Joe! As he approached the second robot spoke: "If the intruder has not acquired the proper knowledge, Big Oswald will kill." Thunderstruck, he leaped back from the entrance and swayed heavily against an instrument panel. The panel lit up and a polite recorded voice began reading something about "President Snell's role in the Eighth World War". He lurched away from the panel and stumbled back toward Mara who sat glumly on the foundation slab of a weighty machine. "What are you laughing about?" she muttered. "We're still in the first grade!" he groaned, envisioning a sequence of rooms. "We'll have to learn the magic of the ancients before we pass to the next." "The ancients weren't so great," she grumbled. "Look at the mural on the wall." Asir looked, and saw only a strange design of circles about a bright splash of yellow that might have been the sun. "What about it?" he asked. "My father taught me about the planets," she said. "That is supposed to be the way they go around the sun." "What's wrong with it?" "One planet too many," she said. "Everyone knows that there is only an asteroid belt between Mars and Venus. The picture shows a planet there." Asir shrugged indifferently, being interested only in the machinery. "Can't you allow them one small mistake?" "I suppose." She paused, gazing miserably in the direction in which her father had gone. "What do we do now?"