There are inventions of great value that one type of society can use—and that would, for another society, be most nastily deadly!
Hauling around an asteroid that had a mass on the order of one hundred seventy-four million metric tons required adequate preparation. The nonmagnetic stony asteroids are an absolute necessity for the Belt Cities. In order to live, man needs oxygen, and there is no trace of an atmosphere on any of the little Belt worlds except that which Man has made himself and sealed off to prevent it from escaping into space. Carefully conserved though that oxygen is, no process is or can be one hundred per cent efficient. There will be leakage into space, and that which is lost must be replaced. To bring oxygen from Earth in liquid form would be outrageously expensive and even more outrageously inefficient—and no other planet in the System has free oxygen for the taking. It is much easier to use Solar energy to take it out of its compounds, and those compounds are much more readily available in space, where it is not necessary to fight the gravitational pull of a planet to get them. The stony asteroids average thirty-six per cent oxygen by mass; the rest of it is silicon, magnesium, aluminum, nickel, and calcium, with respectable traces of sodium, chromium, phosphorous manganese, cobalt, potassium, and titanium. The metallic nickel-iron asteroids made an excellent source of export products to ship to Earth, but the stony asteroids were for home consumption.
"'Mister' comes ultimately from the Latin magister, meaning 'master' or 'teacher'. And while I may be your master, I wouldn't dare think I could teach you anything."
"What happens if you die in here?" he asked conversationally.
"Every Wednesday and Saturday," the voice repeated.
Morgan waited again, got nothing further, and asked: "Dead?"
"'Course he was dead. They was tryin' to get somethin' out of him. Somethin' about a cable. He jumped one of the guards, and they blackjacked him. Hit 'im too hard, I guess. Guard sure got hell for that, too. Me, I'm lucky. They don't ask me no questions."
"What are you in for?" Morgan asked.
"Don't know. They never told me. I don't ask for fear they'll remember. They might start askin' questions."
Of course not," Morgan said soothingly. "I don't suggest that you should. But I do suggest that Mr. Fergus be very careful about going through doorways—or any other kind of opening—from now on. I suggest that he refrain from passing between any pair of reasonably solid, well-anchored objects. I suggest that he stay away from bathtubs. I suggest that he be very careful about putting his legs under a table or desk. I suggest that he not look out of windows. I could make several suggestions. And he shouldn't go around feeling in front of him, either. He might lose something
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