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"No report, eh?" asked Walters.

"No, sir," replied Steve. "I thought one would be waiting for me when I got back from Pluto. But there wasn't any."

"Ummmh!" mused Walters. He looked at his calendar. "About time for them to send in a second report too. Tell you what, Steve. They might be having a tough time setting up things out there on Roald. Suppose you get things organized to investigate the uranium report. And if no word comes in from the cadets by the end of the week, then you can blast off."

"Thank you, sir," said Strong. "Will you excuse me, sir? I'd like to get to work right away."

At Walters' nod, Strong saluted briskly and left the office. Walters turned to Joan.

"You know, I don't think he's half as interested in finding a big uranium deposit as he is in seeing those boys!"

* * * * *

In four separate soundproof cubicles in a small office in the Administration Building on Roald, the three space cadets and Jeff Marshall racked their brains to remember simple equations and formulas, knowledge learned years ago but long-since forgotten, for the more complicated subjects of space, time, and rocket travel. Now, trying to recall simple arithmetic and other elementary studies, the cadets and Marshall worked eighteen hours a day. Speaking directly into soundscribers and filling what seemed to be miles of audio tape, the four spacemen attempted to build a comprehensive library of a hundred carefully selected subjects for the children of Roald. Professor Sykes listened to the study spools as they were completed. He listened carefully, reviewed their work, edited it, and made notes for follow-up comment. Then, at the end of the day, he would hold a final meeting with them, outline what he wanted the next day, and reject spools that he felt were not satisfactory. For older children's studies, the three cadets and Jeff had divided their work into four classifications. Roger covered electronics, astrophysics, astrogation, and allied fields. Astro took charge of rockets, missiles, power machinery, and applied uses of atomic energy. Jeff's work was biological, bacteriological, mineralogical, and geological. Tom covered social studies, government, economy, and history.

Resting as comfortably as possible, each of the four spacemen would sit and think. And when he had gone as far back as he could in his memory of formal education and acquired knowledge, he would begin to talk into the soundscriber. Of all the spools, Tom's were edited the least. And Professor Sykes had unbent enough to compliment the curly-haired cadet for his lucid thinking and acute memory. Astro's work needed the most editing. The giant Venusian found it difficult to explain what he did when he repaired atomic power plants, or how he could look at a piece of machinery and know instinctively when it was out of order. He worked twice as hard as the others, simply because Sykes made him do everything over.

On the other hand, Roger sailed along as smoothly as a jet boat. His grasp of the fundamentals in his field made it easy for him to fill the study spools with important information. Jeff, too, found it easy to explain the growth of plants, the function of bacteria, the formation of planet crusts, and other allied subjects.

So, day after day, Tom, Astro, Roger, and Jeff Marshall spent their waking hours in the cubicles searching their minds for every last precious drop of knowledge they could impart to the children of Roald.

Vidac's warning to Professor Sykes to keep an eye on Roger had been forgotten by everyone in the concerted effort to do a good job. And when the cadets and Jeff left their work one night after a loud argument between the professor and Roger over the best way to explain the theory of captive planets, they thought nothing of it. The argument hadn't been unusual. It had happened many times on the same score. Professor Sykes was prone to favor dry, factual explanations. And the cadets believed some of the theories needed