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Seven minutes later he turned to Strong and handed him the answer.

"Present position by dead reckoning is northwest quadrant of Mars, chart O, area thirty-nine, sir," he announced confidently.

"I was unable to get a sight on Alpha Centauri"

Strong tried to mask his surprise, but a lifted eyebrow gave him away. "And how did you arrive at this conclusion, Manning?"

"I was unable to get a sight on Alpha Centauri due to the present position of Jupiter, sir," replied Roger easily. "So I took a fix on Earth, allowed for its rotational speed around the sun and took the cross-fix with Regulus as ordered in the problem. Of course, I included all the other factors of the speed and heading of our ship. That was routine."

Strong accepted the answer with a curt nod, motioning for Roger to continue. It would not do, thought Strong, to let Manning know that he was the first cadet in thirty-nine years to make the correct selection of Earth in working up the fix with Regulus, and still have the presence of mind to plot a meteor without so much as a half-degree error. Of course the problem varied with each cadet, but it remained essentially the same.

"Seven-and-a-half minutes. Commander Walters will be surprised, to say the least," thought Steve.

Forty-five minutes later, Roger, as unruffled as if he had been sitting listening to a lecture from a sound slide, handed in the rest of his papers, executed a sharp salute and walked out.

"Two down and one to go," thought Strong, and the toughest one of them all coming up. Astro. The big Venusian was unable to understand anything that couldn't be turned with a wrench. The only thing that would prevent Unit 42-D from taking Academy unit honors over Unit 77-K, the unit assigned to Lieutenant Wolcheck, would be Astro. While none of the members of the other units could come up to the individual brilliance of Corbett or Manning, they worked together as a unit, helping one another. They might make a higher unit rating, simply because they were better balanced.

He shrugged his shoulders and collected the papers. It was as much torture for him, as it was for any cadet, he thought, and turned to the door. "All right, Astro," he said to himself, "in ten minutes it'll be your turn and I'm going to make it tough!"

Back in the quarters of Unit 42-D, Tom and Astro still pored over the books and papers on the desk.

"Let's try again, Astro," sighed Tom as he hitched his chair closer to the desk. "You've got thirty tons of fuel—you want to find the compression ratio of the number-one firing-tube chamber—so what do you do?"

"Start up the auxiliary, burn a little of the stuff and judge what it'll be," the big cadet replied. "That's the way I did it on the space freighters."

"But you're not on a space freighter now!" exclaimed Tom. "You've got to do things the way they want it done here at the Academy. By the book! These tables have been figured out by great minds to help you, and you just want to burn a little of the stuff and guess at what it'll be!" Tom threw up his hands in disgust.

"Seems to me I heard of an old saying back in the teen centuries about leading a horse to water, but not being able to make him drink!" drawled Roger from the doorway. He strolled in and kicked at the crumpled sheets of paper that littered the floor, stark evidence of Tom's efforts with Astro.

"All right, wise guy," said Tom, "suppose you explain it to him!"

"No can do," replied Roger. "I tried. I explained it to him twenty times this morning while you were taking your control-deck manual." He tapped his head delicately with his forefinger. "Can't get through—too thick!"

Astro turned to the window to hide the mist in his eyes.

"Lay off, Roger," snapped Tom. He got up and walked over to the big cadet. "Come on, Astro, we haven't got much time. You're due in the examination hall in a few minutes."

"It's no good, Tom, I just can't understand that stuff." Astro turned and faced his unit-mates, his voice charged with sudden emotion. "Just fifteen minutes on the power deck of anything with rockets in her