Isaac Asimov - The Mammoth Book of Golden Age SF

He enjoyed working with his hands. His boyhood dream had been to be a builder of fission power plants. He had even studied engineering — before he married Aurora, and had to take over the ailing mechanicals agency from her indolent and alcoholic father. He was whistling happily by the time the little task was done.

When he went back through the kitchen to put up his tools, he found the household android busily clearing the untouched dinner away from the table — the androids were good enough at strictly routine tasks, but they could never learn to cope with human unpredictability.

“Stop, stop!” Slowly repeated, in the proper pitch and rhythm, his command made it halt, and then he said carefully, “Set — table; set — table.”

Obediently, the gigantic thing came shuffling back with the stack of plates. He was suddenly struck with the difference between it and those new humanoids. He sighed wearily. Things looked black for the agency.

Aurora brought her new lodger in through the kitchen door. Underhill nodded to himself. This gaunt stranger, with his dark shaggy hair, emaciated face, and threadbare garb, looked to be just the sort of colorful, dramatic vagabond that always touched Aurora’s heart. She introduced them, and they sat down to wait in the front room while she went to call the children.

The old rogue didn’t look very sick, to Underhill. Perhaps his wide shoulders had a tired stoop, but his spare, tall figure was still commanding. The skin was seamed and pale, over his rawboned, cragged face, but his deep-set eyes still had a burning vitality.

His hands held Underhill’s attention. Immense hands, they hung a little forward when he stood, swung on long bony arms in perpetual readiness. Gnarled and scarred, darkly tanned, with the small hairs on the back bleached to a golden color, they told their own epic of varied adventure, of battle perhaps, and possibly even of toil. They had been very useful hands.

“I’m very grateful to your wife, Mr. Underhill.” His voice was a deep-throated rumble, and he had a wistful smile, oddly boyish for a man so evidently old. “She rescued me from an unpleasant predicament, and I’ll see that she is well paid.”

Just another vivid vagabond, Underhill decided, talking his way through life with plausible inventions. He had a little private game he played with Aurora’s tenants — just remembering what they said and counting one point for every impossibility. Mr. Sledge, he thought, would give him an excellent score.

“Where are you from?” he asked conversationally.

Sledge hesitated for an instant before he answered, and that was unusual — most of Aurora’s tenants had been exceedingly glib.

“Wing IV.” The gaunt old man spoke with a solemn reluctance, as if he should have liked to say something else. “All my early life was spent there, but I left the planet nearly fifty years ago. I’ve been traveling ever since.”

Startled, Underhill peered at him sharply. Wing IV, he remembered, was the home planet of those sleek new mechanicals, but this old vagabond looked too seedy and impecunious to be connected with the Humanoid Institute. His brief suspicion faded. Frowning, he said casually:

“Wing IV must be rather distant.”

The old rogue hesitated again, and then said gravely:

“One hundred and nine light-years, Mr. Underhill.”

That made the first point, but Underhill concealed his satisfaction. The new space liners were pretty fast, but the velocity of light was still an absolute limit. Casually, he played for another point:

“My wife says you’re a scientist, Mr. Sledge?”

“Yes.”

The old rascal’s reticence was unusual. Most of Aurora’s tenants required very little prompting. Underhill tried again, in a breezy conversational tone:

“Used to be an engineer myself, until I dropped it to go into mechanicals.” The old vagabond straightened, and Underhill paused hopefully. But he said nothing, and Underhill went on, “Fission plant design and operation. What’s your speciality, Mr. Sledge?”

The old man gave him a long, troubled look, with those brooding, hollowed eyes, and then said slowly:

“Your wife has been kind to me, Mr. Underhill, when I was in desperate need. I think you are entitled to the truth, but I must ask you to keep it to yourself. I am engaged on a very important research problem, which must be finished secretly.”

“I’m sorry.” Suddenly ashamed of his cynical little game, Underhill spoke apologetically. “Forget it.”

But the old man said deliberately:

“My field is rhodomagnetics.”

“Eh?” Underhill didn’t like to confess ignorance, but he had never heard of that. “I’ve been out of the game for fifteen years,” he explained. “I’m afraid I haven’t kept up.”

The old man smiled again, faintly.

“The science was unknown here until I arrived, a few days ago,” he said. “I was able to apply for basic patents. As soon as the royalties start coming in, I’ll be wealthy again.”

Underhill had heard that before. The old rogue’s solemn reluctance had been very impressive, but he remembered that most of Aurora’s tenants had been very plausible gentry.

“So?” Underhill was staring again, somehow fascinated by those gnarled and scarred and strangely able hands. “What, exactly, is rhodomagnetics?”

He listened to the old man’s careful, deliberate answer, and started his little game again. Most of Aurora’s tenants had told some pretty wild tales, but he had never heard anything to top this.

“A universal force,” the weary, stooped old vagabond said solemnly. “As fundamental as ferromagnetism or gravitation, though the effects are less obvious. It is keyed to the second triad of the periodic table, rhodium and ruthenium and palladium, in very much the same way that ferromagnetism is keyed to the first triad, iron and nickel and cobalt.”

Underhill remembered enough of his engineering courses to see the basic fallacy of that. Palladium was used for watch springs, he recalled, because it was completely non-magnetic. But he kept his face straight. He had no malice in his heart, and he played the little game just for his own amusement. It was secret, even from Aurora, and he always penalized himself for any show of doubt.

He said merely, “I thought the universal forces were already pretty well known.”

“The effects of rhodomagnetism are masked by nature,” the patient, rusty voice explained. “And, besides, they are somewhat paradoxical, so that ordinary laboratory methods defeat themselves.”

“Paradoxical?” Underhill prompted.

“In a few days I can show you copies of my patents, and reprints of papers describing demonstration experiments,” the old man promised gravely. “The velocity of propagation is infinite. The effects vary inversely with the first power of the distance, not with the square of the distance. And ordinary matter, except for the elements of the rhodium triad, is generally transparent to rhodomagnetic radiations.”

That made four more points for the game. Underhill felt a little glow of gratitude to Aurora, for discovering so remarkable a specimen.

“Rhodomagnetism was first discovered through a mathematical investigation of the atom,” the old romancer went serenely on, suspecting nothing. “A rhodomagnetic component was proved essential to maintain the delicate equilibrium of the nuclear forces. Consequently, rhodomagnetic waves tuned to atomic frequencies may be used to upset that equilibrium and produce nuclear instability. Thus most heavy attoms — generally those above palladium, 46 in atomic number — can be subjected to artificial fission.”

Underhill scored himself another point, and tried to keep his eyebrows from lifting. He said, conversationally: