‘Perfect,’ said Tessa Wendel. ‘Perfect, perfect, perfect.’ She made a gesture as though she were nailing something to the wall, firmly and hard. ‘Perfect.’

Crile Fisher knew what she was talking about. Twice, in two different directions, they had passed through hyperspace. Twice Crile had watched the pattern of stars change somewhat. Twice he had searched out the Sun, finding it a bit dimmer the first time, a bit brighter the second. He was beginning to feel like an old hyperspatial knockabout.

He said, ‘The Sun isn't bothering us, I take it.’

‘Oh, it is, but in a perfectly calculable way, so that the physical interference is a psychological pleasure - if you know what I mean.’

Fisher said, playing the devil's advocate, ‘The Sun's pretty far away, you know. The gravitational effect must be pretty close to zero.’

‘Certainly,’ said Wendel, ‘but pretty close to zero isn't zero. The effect is measurable. Twice we passed through hyperspace, with the virtual path first approaching the Sun obliquely and then receding at another angle. Wu did the calculations beforehand, and the path we took fit those calculations to all the decimal points we could reasonably ask. The man's a genius. He weaves shortcuts into the computer program in a fashion you wouldn't believe.’

‘I'm sure,’ murmured Fisher.

‘So there's no question now, Crile. We can be at the Neighbor Star by tomorrow. By today - if we're really in a hurry. Not very close, of course. We may have to coast inward toward the star for a reasonable period of time, as a precautionary measure. Besides, we don't know the mass of the Neighbor Star with sufficient precision to take too many chances on a really close approach. We don't want to be hurled off unexpectedly and have to work our way back.’ She shook her head admiringly, ‘That Wu. I'm so pleased with him, I can't begin to describe it.’

Fisher said cautiously, ‘Are you sure you don't feel a little annoyed?’

‘Annoyed? Why?’ She stared at Fisher in surprise, then said, ‘Do you think I ought to be jealous?’

‘Well, I don't know. Is there a chance that Chao-Li Wu will get the credit for working out superluminal flight - I mean, the true details of it - and that you'll be forgotten, or remembered only as a forerunner?’

‘No, not at all, Crile. It's nice of you to worry on my behalf, but matters are secure. My work is recorded in full detail. The basic mathematics of superluminal flight are mine. The engineering details I have also contributed to, although others will get the major credit for designing the ship, and should. What Wu has done has been to add a correction factor to the basic equations. Highly important, of course, and we can now see that superluminal flight wouldn't be practical without it, but it's just the icing on the cake. The cake is still mine.’

‘Fine. If you're sure of that, I'm happy.’

‘As a matter of fact, Crile, I'm hoping Wu will now take the lead in developing superluminal flight. The fact is, I'm past my best years - scientifically, that is. Only scientifically, Crile.’

Fisher grinned. ‘I know that.’

‘But scientifically, I am over the hill. The work I've done has been the mining of the concepts I had when I was a graduate student. It's been a matter of about twenty-five years of drawing conclusions, and I've gone about as far as I can go. What's needed are brand-new concepts, entirely new thoughts, a branching off into uncharted territory. I can't do that any more.’

‘Come, Tessa, don't underrate yourself.’

‘That's never been one of my faults, Crile. New thoughts are what we need youth for. It's not just young brains that young people have, it's new brains. Wu has a genome that has never appeared in humanity before. He's had experiences that are crucially his - no-one else's. He can have new thoughts. Of course, he bases them on what I have done before him, and he owes a great deal to my teaching. He's a student of mine, Crile, a child of my intellect. All that he does well reflects well on me. Jealous of him? I glory in him. What's the matter, Crile? You don't look happy.’

‘I'm happy if you are, Tessa, no matter how I look. The trouble is that I have the feeling you're feeding me the theory of scientific advance. Weren't there cases in the history of science, as in everything else, where jealousy existed, and where teachers detested their students for surpassing them?’

‘Certainly. I could quote you half a dozen notorious cases right off the top of my head, but those are rare exceptions and the fact is that I don't feel that way right now. I don't say that it isn't conceivable that I may at some time lose patience with Wu and the Universe, but it isn't happening at the moment, and I intend to savor this moment while it- Oh, now what?’

She pushed the ‘Receive’ contact and Merry Blankowitz's young face appeared trimensionally in the transmitter.

‘Captain,’ she said hesitantly. ‘We're having a discussion out here and I wonder if we can consult you.’

‘Is something wrong with the flight?’

‘No, Captain. It's just a discussion over strategy.’

‘I see. Well, you needn't file in here. I'll come out to the engine room.’

Wendel blanked out the face.

Fisher muttered, ‘Blankowitz doesn't usually sound that serious. What's bugging them, do you suppose?’

‘I'm not going to speculate. I'll go out there and find out.’ And she motioned Fisher to follow.

There were the three of them, sitting in the engine room, all of them with seats carefully on the floor, despite the fact that they were under zero-gravity at the moment. They might just as well have been sitting each on a different wall, but that would have detracted from the seriousness of the situation, and it would have shown disrespect for the office of Captain, besides. There was a complex system of etiquette that had long been developed for zero-gravity.

Wendel did not like zero-gravity and if she had wanted to push her Captain's privileges, she could have insisted on the ship being in rotation at all times to produce a centrifugal effect that would have produced some feeling of gravity. She knew perfectly well that computing a flight path was easier when the ship was at rest, both translationally and rotationally, with respect to the Universe as a whole, but calculating it under constant rotational velocity didn't raise the difficulty to too high a level.

Nevertheless, to insist on such motion would have been disrespectful to the person at the computer. Etiquette again.

Tessa Wendel took her seat, and Crile Fisher could not help but notice (with a secret, ingrown smile) that she lurched slightly. For all her Settlement background, she had clearly never gotten her space legs. He himself (and there was another secret smile - of satisfaction, this time), for all that he was an Earthrnan, could move about in zero-gravity as though he were born to it.

Chao-Li Wu took a deep breath. He had a broad face - the type that looked like it belonged with a short body, but he was taller than average, when he stood up. His hair was dark and perfectly straight and his eyes were markedly narrow.

He said softly, ‘Captain.’

Wendel said, ‘What is it, Chao-Li? If you tell me some problem has developed in the programming, I may be tempted to choke you.’

‘No problem, Captain. No problem at all. In fact, there is such an absence of problems that it strikes me that we're through and should go back to Earth. I would like to suggest that.’

‘Back to Earth?’ Wendel had paused before she said that, had taken the time to look a little stupefied. ‘Why? We haven't accomplished our task yet.’

‘I think we have, Captain,’ said Wu, his face growing expressionless. ‘We just didn't know what our task was, to begin with. We have worked out a practical system of superluminal flight, and we didn't have that when we left Earth.’

‘I know that, but what of it?’

‘And we don't have any means of communication with Earth. If we go on now to the Neighbor Star and if something happens to us, if something goes wrong, Earth will not have practical superluminal flight and there is no telling when they will. This could have a serious affect on Earth's evacuation as the Neighbor Star approaches. I feel that it is important that we go back and explain what we've learned.’

Wendel had listened gravely. ‘I see. And you, Jarlow, what are your views on this?’

Henry Jarlow was tall and blond and dour. There was a settled melancholy on his face that gave a totally wrong impression of his character, and his long fingers (which had nothing apparently delicate about them) were magic when they worked with the interior of computers or with almost any instrument on board.

He said, ‘I think Wu makes sense, frankly. If we had superluminal communication, we'd get the information back to Earth that way and go on. What would happen to us after that would be of no importance except to us. As it is, we can't sit on the gravitational correction.’

‘And you, Blankowitz?’ asked Wendel quietly.

Merry Blankowitz stirred uneasily. She was a small young woman and her long dark hair was cut straight across, just over her eyebrows. Between that and the delicacy of her bone structure and her quick, nervous movements, she looked like a miniature Cleopatra.

She said, ‘I don't really know. I don't have very definite feelings about this, but the men seem to have talked me into it. Don't you think it's important to get the information to Earth? We've worked out crucial effects on this trip and we need more and better ships, with computers designed to take the gravitational correction into account. We'll be able to make a single transition between the Solar System and the Neighbor Star and do it under stronger gravitational intensities so that we can start closer to the Sun and end closer to the Neighbor Star and not have to spend weeks of coasting at both ends. It seems to me that Earth has to know about this.’

Wendel said, ‘I see. The whole point seems to me to be whether it wouldn't be wise to get the information of the gravitational correction back to Earth right now. Wu, is that really as essential as you make it appear? You didn't get the idea for the correction here on the ship. It seems to me that you discussed it with me months ago.’ She thought a moment. ‘Almost a year ago.’

‘We didn't really discuss it, Captain. You were impatient with me, as I recall, and wouldn't really listen.’

‘Yes, I've admitted I was mistaken. But you did write it down. I told you to make up a formal report and that I would go over it when I had time.’ She held up a hand. ‘I know I never had time to go over it, and I don't even recall if I received it, but I imagine, Wu, that you - being you - would have prepared the report in some detail, and with all the reasoning and mathematics anyone could want. Didn't you do that, Wu, and isn't that report in the records?’