them to scan for evidences of civilization. "A silver ball a kilometer or two in diameter would be most logically an installation big enough to hide near, but out of close sensor range. "You can't get close to that thing and survive." Whether or not that was what happened or whether there was simply no brain sent to that system we don't know. That much mass causes the star to show a fairly obvious perturbation to a point no farther away than Tlesson, but we can't be sure. There was no brain in the system and there was one in all the other close systems, so we can assume the one here was a thin film on the neutron mass. Next was Leepup. There were three possible planets in the system, but Leepup was the one where we found the brain. It was building much on the order of the one on Tohm, so TR didn't waste any time. It hit the dome with a disruptor first, then slagged it. All the robots shut down except for some in a mine a few kilometers away. I went down to the surface. The robots totally ignored me, so I was able to locate the sender computer and to shut it down. It was preprogrammed to direct the mining of the vanadium there and wasn't programmed for anything else. I spent awhile reading its boards, while figuring how the system worked. I had the robots all go into the cave and wrap themselves in a preservative box from the inside, then to shut themselves off. I used the system to call all the other robots still working to join them, then shut down the entire system. Those servos may someday be very useful to someone. If they had been designed for military uses I wouldn't have saved them, but there's no sense in destroying things like that if they can possibly be used for a good purpose later. It would be a simple matter of reprogramming the central command computer. It was a simple type of computer we understood since the original meeting at Old Home, so maybe we could reprogram them and have them ready to work on planoforming projects or something. The next system's brain was housed on a planet called Ziim on my charts. It was the only planet in the system that was in the "life producing" zone that didn't have emerging life. That was encouraging, because it could mean the brains were supposed to avoid life until they built strength. "Nuts!" TR retorted. "On Flimt we learned better than that!" "Then maybe this one had ... no," I replied. "They're to use intelligent life, and are to avoid basic lifeforms. There's nothing the stage of life on these planets could offer except problems. Molds and bacteria could attack the materials used in building things, so it's easier to use a planet without those things, so long as there wasn't something else that could be used to greater advantage. "It's a matter of weighing the advantages against the disadvantages. The military mind. There simply isn't anything worth conquering on those planets. "I hope this setup is identical to those on Tohm and Leepup!" "Request denied! I don't like this much at all! It means Thing figured it wrong, and we have to go to all the systems where there are no planets to try to trace where they might've gone from there." "Why?" "Because the fact this thing has the same situation as those on Tohm and Leepup but acted in a very different manner shows it has some ability to make choices! We have to see what else is different here and try to ... we're lucky all of these closer systems had planets of one sort or another. Farther out means less chances of them going far, so we should be able to find them all. They're still slower than light, so our original sphere is the same. We'll have to find the closer ones, count them, and trace the second row outward. That militaristic brain certainly wouldn't have programmed two of them for one system under any circumstances whatever." "Whatever you say. I guess you know what you're talking about. "Let's do something about that thing down there on Ziim. I'm afraid it'll take some time if there's one on Killit.