Heavy Planet

as quickly as he could he pushed the material into the widening space. “That’s all,” he reported when he had done his best, and the students relaxed again. So did the pile of snow. LaVerne, optimistic by nature, felt sure that the tank had not settled quite back to its original position, and kept trying; but after an hour which left him more exhausted than he had ever felt in his three Earth years on Mesklin, he had to admit that the idea was qualitatively sound but quantitatively inadequate. During those days, the student who was trying to climb the slope had made little progress. Once he had gotten nearly a third of the way before sliding most of the way back in a smother of white dust; four or five times he had lost the fight in the first yard or two. The rest of his attempts came between those limits. But it finally became evident that the man’s air was not going to be the real limiting factor. Destigmet pointed out another one to him. “Some time ago, Doctor, one of your fellows taught us about a fact he claimed was very basic — the Law of Conservation of Energy. If I have the terminology right, we can apply very large forces by your standards, but as that law should tell you, there is a limit to the amount of work we can do without food. None of us expected to need food in this class, and we brought none with us.” One of the others cut in. “Won’t people from the College start looking for us anyway? This class should have been over days ago.” LaVerne frowned invisibly behind the blood-stained face plate, which he had no means of cleaning. “They’ll be looking, but finding us will be another story,” he said. “They’d expect to see the tank miles away on the smooth surface of the peninsula. When they don’t, they’ll think we got swept into the sea, or went off to the forest country for some reason. They won’t look over this area closely enough to find the hole we left, I suspect. It’s possible we’ll get out of this with their help, but don’t count on it.” Estnerdole suddenly became excited. “Why not build a tower we can climb, with the water ice from the cliff? We can chip it out easily enough without tools, or even melt it out with the snow — no, that wouldn’t leave us any to work with, but—” His voice trailed off as more difficulties became apparent to him. LaVerne was pessimistic, too, after the just-completed practical demonstration of how much material would be needed even to prop up the tank. Then he brightened. “We could use the ice to get this machine upright — big chunks of it would be more practical and easier to move than the snow. Of course, even that doesn’t get us any closer to getting out of here; the tank certainly isn’t going to climb this sandhill even if I get into it. If only—” He paused, and the ensuing silence stretched out for long seconds. Even with the man hidden in his armor, the listeners got the impression that something had happened. Then he spoke again, and his tone confirmed the suspicion. “Thanks, Es. That does it. Start digging ice, gentlemen. We’ll be out of here in a couple of hours!” Actually, it took less than three days.

“You look bothered,” remarked Thomasian, LaVerne’s department head. “Delayed shock from your narrow escape, or what?”

“It wasn’t that narrow,” replied the teacher. “I had hours of air still in the suit when the spinner picked us up, and we could have worked the tank upright to get at more if I had needed it. You’d have searched the area closely enough to find that hole sooner or later.”

“Later would probably have been too late — and the really narrow squeak I was thinking of was the fall. Fifteen meters under three gees — sooner you than me. If it hadn’t been for that snow bank, we’d have had to cut you out of the flattened remains of that tank — not that it would have been worth doing. Of course any of your students should have been able to think of tossing pieces of water ice over the slope, especially after you’d discussed with them why the cuesta was so deeply undercut. So should you, for that matter—”

“Hogback,” LaVerne responded almost automatically. “Sure, all sorts of ideas are obvious afterward. At the time, I wasn’t quite sure that this one would work, even if I did sound as enthusiastic as I could and even though I did have experience to go by. Still, I was afraid it would simply melt holes in the slope; but it went fine. The liquid formed where the two ices met just soaked into the surrounding snow, spreading out and diluting the water ice until the mixture’s melting point came up to the local temperature again — and froze into a continuous mass. It was hard enough for Estnerdole to climb out and go for help in less than an hour, I’d guess; I didn’t actually time it.”

“What was the experience you could go by? And if it was so easy and safe, what’s bothering you?”

“The same thing. A teaching problem. They claim that Mesklinite psychology is enough like ours for teaching techniques to be about the same, effectively. They expect us to — er—‘relate’ new facts to known experience.”

“Of course. So?”

“So the experience in question should obviously be one familiar to the students, not just the teacher. What sparked this idea for me was the memory of sugar getting lumpy in the bowl when it gets damp. You know, I’m just a little shaky on the local biochemistry, chief — tell me: what do Mesklinites use for coffee, and what do they put in it?”

STAR LIGHT

1: PIT STOP

Beetchermarlf felt the vibrations die out as his vehicle came to a halt, but instinctively looked outside before releasing the Kwembly’s helm. It was wasted effort, of course. The sun, or rather, the body he was trying to think of as the sun, had set nearly twenty hours before. The sky was still too bright for stars to be seen, but not bright enough to show details on the almost featureless dusty snow field around him. Behind, which was the only direction he could not see from the center of the bridge, the Kwembly’s trail might have provided some visual reference; but from his post at the helm there was no clue to his speed. The captain, stretched out on his platform above and behind the helmsman, interpreted correctly the latter’s raised head. If he was amused, he concealed the fact. With nearly two human lifetimes spent on Mesklin’s unpredictable oceans he had never learned to like uncertainty, merely to live with it. Commanding a “vessel” he did not fully understand, travelling on land instead of sea and knowing that his home world was over three parsecs away did nothing to bolster his own self-confidence, and he sympathized fully with the youngster’s lack of it. “We’re stopped, helmsman. Secure, and start your hundred-hour maintenance check. We’ll stay here for ten hours.”

“Yes, sir.” Beetchermarlf slipped the helm into its locking notch. A glance at the clock told him that over an hour of his watch remained, so he began checking the cables which connected the steering bar with the Kwembly’s forward trucks. The lines were visible enough, since no effort had been made to conceal essential machinery behind walls. The builders of the huge vehicle and her eleven sister “ships” had not been concerned with appearance. It took only a few seconds to make sure that the few inches of cable above the bridge deck were still free of wear. The helmsman gestured an “all’s well” to the captain, rapped on the deck for clearance, waited for acknowledgment from below, opened the starboard trap, and vanished down the ramp to continue his inspection. Dondragmer watched him go with no great concern. His worries were elsewhere, and the helmsman was a dependable sailor. He put the steering problem from his mind for the moment, and reared the front portion of his eighteen-inch body upward until his head was level with the speaking tubes. A sirenlike wail which could have been heard over one of Mesklin’s typhoons and was almost ridiculous in the silence of Dhrawn’s snow field secured the attention of the rest of the crew. “This is the captain. Ten hours halt for maintenance check; watch on duty get started. Research personnel follow your usual routine, being sure to check with the bridge before going outside. No flying until the scouts have been overhauled. Power distribution, acknowledge!”

“Power checking.” The voice from the speaking tube was a little deeper than Dondragmer’s. “Life support, acknowledge!”

“Life support checking.”

“Communication, acknowledge!”

“Checking.”