A journey out to Gargantua sounded difficult and dangerous. Birdie Kelly had been dreading the prospect. As he got to know Julius and Steven Graves better he liked the idea even less; and when E. C. Tally’s presence on the trip was thrown in for good measure, Birdie’s level of apprehension was raised to new heights.

Yet that final addition proved to be the saver. In some way that Birdie could not explain, Steven Graves and E. C. Tally canceled each other out. Maybe it was because they never stopped arguing. The annoyance level of their arguments was enough to reduce most other irritations to background level, and it allowed Birdie to take his mind off the unpleasant reality of the journey.

That reality had started even before they lifted off from Opal. All three had gone to the edge of one of the Slings, to inspect the ship that Birdie had been offered for the journey. Tally had lagged behind the other two, showing an unnatural interest in a species of domestic waterfowl swimming just offshore.

“You’re saying he’s a bloody robot!” Birdie complained, when he was sure he could not be overheard. “Well, why didn’t somebody tell me that when he first arrived? No wonder he comes across like such an idiot.”

“He’s not a robot.” Julius Graves was eyeing the interplanetary transit vessel with disfavor. The ship was certainly big — ten times the size they needed — but the outer hull was scarred and rusted. On Miranda it would have seen the scrap heap a century earlier. “I really shouldn’t have said anything at all, except that sometime it might be important for you to know. E. Crimson Tally is an embodied computer. His available data base should be huge, even though he lacks human experience and local knowledge.”

“Same difference. Computer, robot. And data base about what? He doesn’t seem to know anything useful.”

“He’s not a computer, or a robot. He has a human body.”

Birdie shuddered. “That’s awful. Whose was it before he got it?”

“Nobody’s. It was grown for him from a library template.” Graves had climbed up to stare through a hatch into the ship’s vast and desolate interior. He sniffed. “Phew. What did you say this was used for last time?”

“Ore freighter.” Birdie peered in. “At least, that’s what they told me. Can’t imagine what sort of ore looked like that. Or smelled like it.” He pulled his head out fast. Even he was impressed by the filth inside. “But I still don’t know what Tally’s doing here.”

“Blame me for that. If I had returned to Miranda as planned, E. C. Tally would have gone with me. He tells me that he was sent to Opal with three goals. First, to determine firsthand the significance of recent events here; second, to accompany me wherever I go; and third, to bring me back with him to Alliance headquarters.” Graves rubbed his hand over the hatch cover and stared at the results with distaste. “Look, this won’t do. The whole inside will have to be cleaned out completely before it’s fit for use.”

“No problem.”

No problem, because Birdie knew that the chances of getting anyone to clean it out were zero; but there was no point in telling that to Graves. It occurred to Birdie that he would willingly settle for the last of those three stated mission objectives for E. C. Tally — all his own problems would go away if only Graves and Tally would just leave. And didn’t it display the most monstrous and the most typical gall, for the Alliance Council to sit hundreds of light-years away and try to call the shots through a half-witted robot?

Tally’s next act had not helped his popularity with Birdie. He had finished his puzzled inspection of the ducks, then wandered over to examine the inside and outside of the ship.

“May I speak?” he said at last.

Birdie swore. “Will you for God’s sake stop saying that? Even when I say no, you speak anyway.”

“My apologies, Commissioner Kelly. Since my request for some reason causes you discomfort, I will try to desist… even though politeness was a basic element of my prime indoctrination. However, I am sure you will be interested in what I have to say now. I have been engaged in computation and analysis. Based on this ship’s history and current condition, I calculate a sixty-six percent chance of catastrophic failure on any extended journey, such as that planned to the planet Gargantua.”

Julius Graves gave a loud grunt of disapproval. Birdie shuddered and felt inclined to echo it. Had he survived Summertide, then, only to be wiped out in space? Not if he could help it. But surely he didn’t need to do anything. This was the moment where Graves would exercise his override authority as a council member and veto the whole journey, no matter what E. C. Tally wanted to do. It was unacceptably dangerous.

“I am sorry, Tally,” Graves said — there, he was going to use his authority, just the way Birdie had hoped. “But we are forced to take exception to your statement. Steven calculates that there is a sixty-percent chance of catastrophic failure — no more!”

“I beg to differ.” Tally looked down his well-designed nose at Graves. “I think that if you itemize the parameter inputs appropriate to the case, as follows, you will find these additional sources of danger…”

And away they went.

The Steven Graves vs. E. Crimson Tally stakes; that was the way Birdie was coming to think of it. As the Incomparable — Birdie was inclined to agree with that name for the rotting hulk — creaked and groaned its smelly and rust-covered way to the outer system, Steven Graves and E. C. Tally went on with their endless arguments.

Who was the winner? Birdie was not sure. The trip out to Gargantua was long and — thank God! — uneventful, and there were few people around to argue the point with. From sheer perversity Birdie went to an unlikely source — and consulted Julius Graves about the Steven-Tally dispute.

The councilor took the question perfectly seriously, wrinkling his bald, scarred forehead before he replied.

“I believe that I can be impartial. And I think it is a standoff. E. C. Tally has the advantage over Steven when it comes to anything involving computational speed — which is no surprise, given that his basic circuitry is many trillions of times as fast. The real surprise is that Steven can do as well as he does. So far as I can tell — Steven and I have discussed this several times — Tally employs direct formula computation whenever possible. Steven, on the other hand, makes extensive use of precomputed and memorized lookup tables and interpolation. Normally Tally will reach a conclusion faster on anything calling for straight computation — but not always.

“Steven’s advantage comes in other areas. Like any human, he enjoys a degree of parallelism that no computer, embodied or not, has ever achieved. To take one simple example, Steven and you and I are capable of remarkable feats of pattern recognition. We can distinguish and name an object familiar to us in a fraction of second, no matter how far off or at what angle we see it. You know who I am at once when we meet, regardless of lighting conditions or distance. Given the slow speed of organic memory, that cannot require more than about one hundred full cycles of our brains, which means tremendous parallel processing. To do the same job of recognition, the inorganic brain of E. C. Tally needs hundreds of billions of serial calculation cycles. Naturally, he will eventually reach the same result. But in this case, Steven will often be faster.”

“Two heads are better than one, you mean.” Birdie was unsmiling. “Either one of them may win. Sounds like we ought to hear from both Steven and E. C. Tally before we make any decision.”

“There is a certain logic to that idea. The other surprise is in information storage. Steven has far slower access, but he has better information packing density. He knows many more facts than E. C. Tally, but he takes longer to retrieve them.” Graves thought for a few moments longer. “And, of course, the final weakness of E. C. Tally is unrelated to computation speed or to memory capacity. It is his inability to allow for the effects of emotion when considering human issues. He will always do his best to make the right decision — his makeup gives him no choice — but his judgment on both human and alien issues will always be impaired. And the farther he is away from the environment in which his principal experience was drawn, the more suspect his decision processes will be.” Graves peered around, making sure that Tally was not lurking somewhere near. “It occurs to me that you and I had better keep a close eye on him. Especially you. He will seek to hide his motives from me, because he knows that I am part of the Council. You must inform me at once if his actions ever appear dangerously simplistic, or insensitive to the subtleties of organic intelligence.”