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     © Copyright William Morrison
     OCR: Wesha, 18 Aug 2025
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   At first they hadn't even known that the Sack existed. If they  had
noticed it at all when they landed on the asteroid, they thought of it
merely as one more outpost of rock on the barren  expanse  of  roughly
ellipsoidal silicate surface, which Captain Ganko  noticed  had  major
and minor axes roughly three and two miles in diameter,  respectively.
It would never have entered anyone's mind that the unimpressive object
they had unconsciously acquired would soon be  regarded  as  the  most
valuable prize in the system.
   The landing had been accidental. The  government  patrol  ship  had
been limping along, and now it had settled  down  for  repairs,  which
would take a good seventy hours. Fortunately, they had plenty of  air,
and their recirculation system  worked  to  perfection.  Food  was  in
somewhat short supply, but it didn't worry them, for  they  knew  that
they could always tighten their belts and do without full rations  for
a few days. The loss of water that had resulted from  a  leak  in  the
storage tanks, however, was a more serious matter. It occupied a  good
part of their conversation during the next fifty hours.
   Captain Ganko said finally, "There's no use talking,  it  won't  be
enough. And there are no supply stations close enough at hand to be of
any use. We'll have to radio ahead and hope that they can get a rescue
ship to us with a reserve supply."
   The helmet mike of his next in command seemed to droop.  "It'll  be
too bad if we miss each other in space, Captain."
   Captain Ganko laughed unhappily. "It certainly will. In  that  case
we'll have a chance to see how we can stand a little dehydration."
   For a time nobody said anything. At last, however, the second  mate
suggested, "There might be water somewhere on the asteroid, sir."
   "Here? How in Pluto would it stick, with a gravity that isn't  even
strong enough to hold loose rocks? And where the devil would it be?"
   "To answer the first question first, it would be retained as  water
of crystallization," replied  a  soft  liquid  voice  that  seemed  to
penetrate his spacesuit and come  from  behind  him.  "To  answer  the
second question, it is half a dozen feet below the  surface,  and  can
easily be reached by digging."
   They had all swiveled around at the first words. But no one was  in
sight in the direction from which the words seemed  to  come.  Captain
Ganko frowned, and his eyes narrowed dangerously. "We don't happen  to
have a practical joker with us, do we?" he asked mildly.
   "You do not," replied the voice.
   "Who said that?"
   "I, Yzrl."
   A crewman became aware of something moving on the surface of one of
the great rocks, and pointed to it. The motion stopped when the  voice
ceased, but they didn't lose sight of it  again.  That  was  how  they
learned about Yzrl, or as it was more often called, the Mind-Sack.

   If  the  ship  and  his  services  hadn't  both  belonged  to   the
government, Captain Ganko could have claimed the Sack for  himself  or
his owners and retired with a wealth far beyond his dreams. As it was,
the thing passed into government control. Its importance was  realized
almost from the first, and Jake Siebling had reason to be  proud  when
more important and more  influential  figures  of  the  political  and
industrial world were finally passed over and he was made Custodian of
the Sack. Siebling was a short, stocky  man  whose  one  weakness  was
self-deprecation. He had carried out one  difficult  assignment  after
another and allowed other men to take the credit. But this job was not
one for a blowhard, and those in charge of making the appointment knew
it. For once they looked beyond credit and superficial reputation, and
chose an individual they disliked somewhat but trusted absolutely.  It
was one of the most effective tributes to  honesty  and  ability  ever
devised.
   The Sack, as Siebling learned from seeing it daily, rarely deviated
from the form in which it had made its first  appearance  -  a  rocky,
grayish lump that roughly resembled a sack  of  potatoes.  It  had  no
features,  and  there  was  nothing,  when  it  was  not  being  asked
questions, to indicate that it had life. It ate rarely  -  once  in  a
thousand years, it said, when left to itself; once a week when it  was
pressed into steady use. It ate or  moved  by  fashioning  a  suitable
pseudopod and stretching the thing out in  whatever  way  it  pleased.
When it had attained its objective, the pseudopod was  withdrawn  into
the main body again and the creature became once more a potato sack.
   It turned out later that the  name  "Sack"  was  well  chosen  from
another point of view, in addition to that of appearance. For the Sack
was stuffed with information, and beyond that, with wisdom. There were
many doubters at first, and some of them retained their doubts to  the
very end, just as some people remained  convinced  hundreds  of  years
after Columbus that the Earth was flat. But those who  saw  and  heard
the Sack had no doubts at all. They tended, if anything, to go too far
in the other direction, and to believe that the Sack knew  everything.
This, of course, was untrue.
   It was the official function of the Sack, established by  a  series
of Interplanetary acts, to answer questions. The first  questions,  as
we have seen, were asked accidentally, by Captain  Ganko.  Later  they
were asked purposefully, but with a purpose that  was  itself  random,
and a few politicians managed to acquire  considerable  wealth  before
the Government put a stop to the leak of  information,  and  tried  to
have the questions asked in a more scientific and logical manner.
   Question time was rationed for months in advance, and sold at  what
was, all things considered, a ridiculously low rate - a  mere  hundred
thousand credits a minute. It was this unrestricted sale of time  that
led to the first great government squabble.
   It was the unexpected failure of the Sack to answer what must  have
been to a mind of its ability an easy question that led to the  second
blowup, which was fierce enough to be called a crisis. A  total  of  a
hundred and twenty questioners, each of  whom  had  paid  his  hundred
thousand, raised a howl that could be heard on every planet, and there
was a legislative investigation, at which Siebling testified  and  all
the conflicts were aired.
   He had left an assistant in charge of the Sack, and now, as he  sat
before the Senatorial Committee, he twisted uncomfortably in front  of
the battery of cameras. Senator Horrigan, his chief interrogator,  was
a bluff, florid, loud-mouthed politician who had been  able  to  imbue
him with a feeling of guilt even as he told his name, age, and  length
of government service.
   "It is your duty to see to it that the Sack is maintained in proper
condition for answering questions, is it not, Mr. Siebling?"  demanded
Senator Horrigan.
   "Yes, sir."
   "Then  why  was  it  incapable  of  answering  the  questioners  in
question? These gentlemen had honestly paid their money  -  a  hundred
thousand credits each. It was necessary, I understand, to  refund  the
total sum. That meant an overall loss to the Government of, let me see
now - one hundred twenty at one hundred thousand each  -  one  hundred
and twenty million credits," he shouted, rolling the words.
   "Twelve million, Senator," hastily whispered his secretary.
   The correction was not made, and  the  figure  was  duly  headlined
later as one hundred and twenty million.
   Siebling said, "As we discovered later, Senator, the Sack failed to
answer questions because it was not a machine, but a living  creature.
It  was  exhausted.  It  had  been  exposed  to   questioning   on   a
twenty-four-hour-a-day basis."
   "And  who  permitted  this  idiotic  procedure?"   boomed   Senator
Horrigan.
   "You yourself, Senator," said Siebling happily. "The procedure  was
provided for in the bill  introduced  by  you  and  approved  by  your
committee."
   Senator Horrigan had never even read the bill to which his name was
attached, and he was certainly not to blame for  its  provisions.  But
this private knowledge of his own innocence did him no good  with  the
public. From that moment he was Siebling's bitter enemy.
   "So the Sack ceased to answer questions for two whole hours?"
   "Yes, sir. It resumed only after a rest."
   "And it answered them without further difficulty?"
   "No, sir. Its response  was  slowed  down.  Subsequent  questioners
complained that they were defrauded of a good part of their money. But
as answers were given, we considered that the complaints were  without
merit, and the financial department refused to make refunds."
   "Do you consider that this cheating of investors in the Sack's time
is honest?"
   "That's none of my business, Senator," returned Siebling,  who  had
by this time got over most of his nervousness. "I merely  see  to  the
execution of the laws. I leave the question of honesty  to  those  who
make them. I presume that it's in perfectly good hands."
   Senator Horrigan  flushed  at  the  laughter  that  came  from  the
onlookers. He was personally unpopular, as unpopular as  a  politician
can be and still remain a politician. He  was  disliked  even  by  the
members of his own party, and some of his best political friends  were
among the laughers. He decided to abandon what had turned out to be an
unfortunate line of questioning.
   "It is a matter of fact, Mr. Siebling, is it  not,  that  you  have
frequently refused admittance to  investors  who  were  able  to  show
perfectly valid receipts for their credits?"
"That is a fact, sir. But -"
   "You admit it, then."
   "There is no question of  `admitting'  anything,  Senator.  What  I
meant to say was -"
   "Never mind what you meant to say. It's what you have already  said
that's important. You've cheated these men of their money!"
   "That is not true, sir. They were given time later. The reason  for
my refusal to grant them admission when they asked for it was that the
time had been previously reserved for  the  Armed  Forces.  There  are
important research questions that come up, and there is, as you  know,
a  difference  of  opinion  as  to  priority.  When  confronted   with
requisitions for time from a commercial investor and a  representative
of the Government, I never took it upon myself to settle the question.
I always consulted with the Government's legal adviser."
   "So you refused to make an independent decision, did you?"
   "My duty, Senator, is to look after the welfare of the Sack.  I  do
not concern myself with political questions. We had a moment  of  free
time the day before I left the asteroid,  when  an  investor  who  had
already paid his money was delayed by a space accident, so instead  of
letting the moment go to waste, I  utilized  it  to  ask  the  Sack  a
question."
   "How you might advance your own fortunes, no doubt?"
   "No, sir. I merely asked it how it might function most efficiently.
I took the precaution of making a  recording,  knowing  that  my  word
might be doubted. If you wish, Senator, I can introduce the  recording
in evidence."
   Senator Horrigan grunted, and waved his  hand.  "Go  on  with  your
answer."
   "The Sack replied that it would require two hours of complete  rest
out of every twenty,  plus  an  additional  hour  of  what  it  called
'recreation'. That is, it wanted to converse with some human being who
would ask what it called sensible questions, and not press for a quick
answer."
   "So you suggest that the Government  waste  three  hours  of  every
twenty-one hundred and eighty million credits?"
   "Eighteen million," whispered the secretary.
   "The time would not be wasted. Any attempt  to  overwork  the  Sack
would result in its premature annihilation."
   "That is your idea, is it?"
   "No, sir, that is what the Sack itself said."
   At this point Senator Horrigan swung into a speech of denunciation,
and Siebling was excused from further testimony. Other witnesses  were
called, but at the end the Senate investigating body was able to  come
to no definite conclusion, and it was decided to interrogate the  Sack
personally.
   It was out of the question for the Sack to come to the  Senate,  so
the Senate quite naturally came to the Sack. The  Committee  of  Seven
was manifestly uneasy as the senatorial ship decelerated and cast  its
grapples toward the asteroid. The members,  as  individuals,  had  all
traveled in space before, but all their previous destinations had been
in civilized territory, and they obviously did not relish the prospect
of landing on this airless and sunless body of rock.
   The televisor companies were alert to their opportunity,  and  they
had  acquired  more  experience  with  desert  territory.   They   had
disembarked and set up their apparatus before the senators  had  taken
their first timid steps out of the safety of their ship.
   Siebling  noted  ironically  that  in  these  somewhat  frightening
surroundings, far from their home grounds, the senators  were  not  so
sure of themselves. It was his part to act the friendly guide, and  he
did so with relish.
   "You see, gentlemen," he said respectfully, "it was decided, on the
Sack's own advice, not to permit it to be further exposed to  possible
collision with stray meteors. It was the meteors which killed off  the
other members of its strange race, and it was a lucky chance that  the
last surviving individual managed to escape destruction as long as  it
has. An impenetrable shelter dome has been built  therefore,  and  the
Sack now lives under its protection. Questioners address it through  a
sound and sight system that is almost as good as being  face  to  face
with it."
   Senator  Horrigan  fastened  upon  the  significant  part  of   his
statement. "You mean that the Sack is safe - and  we  are  exposed  to
danger from flying meteors?"
   "Naturally, Senator. The Sack is unique in the system. Men  -  even
senators - are, if you will excuse  the  expression,  a  decicredit  a
dozen. They are definitely replaceable, by means of elections."
   Beneath his helmet the  senator  turned  green  with  a  fear  that
concealed the scarlet of his anger. "I think it is an outrage to  find
the Government so unsolicitous  of  the  safety  and  welfare  of  its
employees!"
   "So do I, sir. I live here the  year  round."  He  added  smoothly,
"Would you gentlemen care to see the Sack now?"
   They stared at the huge visor screen and saw the  Sack  resting  on
its seat before them, looking like a burlap bag of potatoes which  had
been tossed onto a throne and forgotten there. It looked so definitely
inanimate that it struck them as strange that the thing should  remain
upright instead of toppling over. All  the  same,  for  a  moment  the
senators could not help showing the awe that  overwhelmed  them.  Even
Senator Horrigan was silent.
   But  the  moment  passed.  He  said,  "Sir,  we  are  an   official
Investigating Committee of the Interplanetary Senate, and we have come
to ask you a few questions." The Sack showed no desire to  reply,  and
Senator Horrigan cleared his throat and went on.  "Is  it  true,  sir,
that you require two hours of complete rest in every twenty,  and  one
hour for recreation, or, as I may  put  it,  perhaps  more  precisely,
relaxation?"
   "It is true."
   Senator Horrigan gave the creature its chance, but the Sack, unlike
a senator, did not elaborate. Another of the committee  asked,  "Where
would you find an individual capable of conversing intelligently  with
so wise a creature as you?"
   "Here," replied the Sack.
   "It is necessary to ask questions that are directly to  the  point,
Senator," suggested Siebling. "The Sack  does  not  usually  volunteer
information that has not been specifically called for."
   Senator Horrigan said quickly, "I assume, sir, that when you  speak
of finding an intelligence on a par with your  own,  you  refer  to  a
member of our committee, and I am sure that of all my colleagues there
is not one who is unworthy of being so denominated. But we cannot  all
of us spare the time needed for our manifold other duties, so  I  wish
to ask you, sir, which of  us,  in  your  opinion,  has  the  peculiar
qualifications of that sort of wisdom which is required for this great
task?"
   "None," said the Sack.
   Senator Horrigan looked blank. One of the other  senators  flushed,
and asked, "Who has?"
   "Siebling."
   Senator Horrigan forgot his awe of the Sack, and shouted, "This  is
a put-up job!"
   The other senator who had just spoken now said suddenly, "How is it
that there are no other questioners present? Hasn't  the  Sack's  time
been sold far in advance?"
   Siebling nodded. "I was ordered to cancel all previous appointments
with the Sack, sir."
   "By what idiot's orders?"
   "Senator Horrigan's, sir."
   At this point the investigation might have been said to come to  an
end. There was  just  time,  before  they  turned  away,  for  Senator
Horrigan  to  demand  desperately  of  the  Sack,  "Sir,  will  I   be
re-elected?" But the roar of anger that went up  from  his  colleagues
prevented him from hearing the Sack's answer, and  only  the  question
was picked up and broadcast clearly over the interplanetary network.
   It had such an effect that it in itself provided Senator Horrigan's
answer. He was not re-elected. But before the election he had time  to
cast his vote against Siebling's designation to talk with the Sack for
one hour out of every twenty. The final committee  vote  was  four  to
three in favor of Siebling, and the  decision  was  confirmed  by  the
Senate. And then Senator Horrigan passed temporarily out of the Sack's
life and out of Siebling's.

   Siebling looked forward with some trepidation  to  his  first  long
interview with the Sack. Hitherto he had limited himself to the simple
tasks provided for in his directives  -  to  the  maintenance  of  the
meteor shelter dome, to the provision of a sparse food supply, and  to
the proper placement of an army and Space Fleet  Guard.  For  by  this
time the great value of the Sack had been  recognized  throughout  the
system, and it was widely realized that there would  be  thousands  of
criminals anxious to steal so defenseless a treasure.
   Now, Siebling thought, he would be obliged to talk to  it,  and  he
feared that he would lose  the  good  opinion  which  it  had  somehow
acquired of him. He was in a position strangely like that of  a  young
girl who would have liked nothing better than to talk of  her  dresses
and her boy friends to someone with her own background, and was forced
to endure a brilliant and witty conversation with some man three times
her age.
   But he lost some of his awe when he faced the Sack itself. It would
have been absurd to say that the strange creature's manner put him  at
ease.  The  creature  had  no   manner.   It   was   featureless   and
expressionless, and even when  part  of  it  moved,  as  when  it  was
speaking,  the  effect  was   completely   impersonal.   Nevertheless,
something about it did make him lose his fears.
   For a time he stood before it and said nothing.  To  his  surprise,
the Sack spoke-the first time to his knowledge that  it  had  done  so
without being asked a question. "You will not disappoint me," it said.
"I expect nothing."
   Siebling grinned. Not only had the Sack never before volunteered to
speak, it had never spoken so dryly. For the first time  it  began  to
seem not so much a mechanical brain as the living creature he knew  it
to be. He asked, "Has anyone ever before asked you about your origin?"
   "One man. That was before my time was rationed. And even he  caught
himself when he realized that he might better be asking how to  become
rich, and he paid little attention to my answer."
   "How old are you?"
   "Four hundred thousand years. I can tell you to the fraction  of  a
second, but I suppose that you do not wish me to speak as precisely as
usual."
   The thing, thought Siebling, did have in its way a sense of  humor.
"How much of that time," he asked, "have you spent alone?"
   "More than ten thousand years."
   "You told someone once that your companions were killed by meteors.
Couldn't you have guarded against them?"
   The Sack said slowly, almost wearily, "That was after we had ceased
to have an interest in remaining alive.  The  first  death  was  three
hundred thousand years ago."
   "And you have lived, since then, without wanting to?"
   "I have no great interest in dying  either.  Living  has  become  a
habit."
   "Why did you lose your interest in remaining alive?"
   "Because we lost the future. There had been a miscalculation."
   "You are capable of making mistakes?"
   "We had not lost that capacity. There  was  a  miscalculation,  and
although those of us then living escaped personal disaster,  our  next
generation was  not  so  fortunate.  We  lost  any  chance  of  having
descendants. After that, we had nothing for which to live."
   Siebling nodded. It was a loss of motive that a human  being  could
understand. He asked, "With all  your  knowledge,  couldn't  you  have
overcome the effects of what happened?"
   The Sack said, "The more things become possible to  you,  the  more
you will understand that they cannot be done in  impossible  ways.  We
could not do everything. Sometimes one of the more stupid of those who
come here asks me a question I cannot answer, and then  becomes  angry
because he feels that he has been cheated of his credits.  Others  ask
me to predict the future. I can predict only what I can calculate, and
I soon come to the end of my powers of  calculation.  They  are  great
compared to yours; they are small compared to the possibilities of the
future."
   "How do you happen to know so much? Is the knowledge born in you?"
   "Only the possibility for knowledge  is  born.  To  know,  we  must
learn. It is my misfortune that I forget little."
   "What in the structure of your body, or  your  organs  of  thought,
makes you capable of learning so much?"
   The Sack spoke, but to Siebling the words  meant  nothing,  and  he
said so. "I could predict your lack of comprehension," said the  Sack,
"but I wanted you to realize it for yourself. To make things clear,  I
should be required to dictate ten volumes, and they would be difficult
to understand even for your specialists, in biology and physics and in
sciences you are just discovering."
   Siebling fell silent, and the Sack said, as if musing,  "Your  race
is still an unintelligent one. I have been  in  your  hands  for  many
months, and no one has yet asked me the important questions. Those who
wish to be wealthy ask about minerals and planetary land  concessions,
and they ask which of several schemes for  making  fortunes  would  be
best. Several physicians have asked me how to treat  wealthy  patients
who would otherwise die. Your scientists ask me to solve problems that
would take them years to solve without my help. And when  your  rulers
ask, they are the most stupid of all, wanting to know  only  how  they
may maintain their rule. None ask what they should."
   "The fate of the human race?"
   "That is prophecy of the far future. It is beyond my powers."
   "What _should_ we ask?"
   "That is the question I have awaited. It is difficult  for  you  to
see its importance, only because each of  you  is  so  concerned  with
himself." The Sack paused, and murmured, "I ramble as I do not  permit
myself to when I speak to your fools. Nevertheless, even rambling  can
be informative."
   "It has been to me."
   "The others do not  understand  that  too  great  a  directness  is
dangerous. They ask specific questions which demand specific  replies,
when they should ask something general."
   "You haven't answered me."
   "It is part of an answer to say that a question is important. I  am
considered by your rulers a valuable piece of  property.  They  should
ask whether my value is as great as it seems. They should ask  whether
my answering questions will do good or harm."
   "Which is it?"
   "Harm, great harm."
   Siebling was staggered. He said, "But if you answer truthfully -"
   "The process of coming at the truth is as  precious  as  the  final
truth itself. I cheat you of that. I give your people the  truth,  but
not all of it, for they do not know how to attain it of themselves. It
would be better if they learned that, at the expense  of  making  many
errors."
   "I don't agree with that."
   "A scientist asks me what goes on within a cell, and  I  tell  him.
But if he had studied the cell himself, even though the study required
many years, he would have ended not only with this knowledge, but with
much other knowledge, of  things  he  does  not  even  suspect  to  be
related. He would have acquired many new processes of investigation."
   "But surely, in some cases, the knowledge is useful in itself.  For
instance, I hear that they're already using a  process  you  suggested
for producing uranium cheaply to use on  Mars.  What's  harmful  about
that?"
   "Do you know how much of the necessary  raw  material  is  present?
Your scientists have not investigated that, and they will use  up  all
the raw material and discover only too late what they have  done.  You
had the same experience on Earth? You learned how to purify  water  at
little expense, and you squandered water so recklessly that  you  soon
ran short of it."
   "What's wrong with saving the life of a dying patient, as  some  of
those doctors did?"
   "The first question to ask is whether the patient's life should  be
saved."
   "That's exactly what a doctor isn't supposed to ask. He has to  try
to save them all. Just as you never ask whether people  are  going  to
use your knowledge for a good purpose or  a  bad.  You  simply  answer
their questions."
   "I answer because I am indifferent, and I  care  nothing  what  use
they make of what I say. Are your doctors also indifferent?"
   Siebling said, "You're supposed to answer questions, not ask  them.
Incidentally, why do you answer at all?"
   "Some of your men find joy in boasting, in  doing  what  they  call
good, or in making money. Whatever mild pleasure I can  find  lies  in
imparting information."
   "And you'd get no pleasure out of lying?"
   "I am as incapable of telling lies as one of your birds  of  flying
off the Earth on its own wings."
   "One thing more. Why did you ask to talk to me, of all people,  for
recreation? There are brilliant scientists, and great men of all kinds
whom you could have chosen."
   "I care nothing for your race's greatness. I chose you because  you
are honest."
   "Thanks. But there are other honest men on Earth, and on Mars,  and
on the other planets as well. Why me, instead of them?"
   The Sack seemed to hesitate. "Your choice gave me a mild  pleasure.
Possibly because I knew it would be displeasing to those men."
   Siebling grinned. "You're not quite so indifferent as you think you
are. I guess it's pretty hard to be indifferent to Senator Horrigan."
   This was but the first part of many conversations  with  the  Sack.
For a long time Siebling could not help being disturbed by the  Sack's
warning that its presence was a calamity instead of a blessing for the
human race, and this in more ways than one. But  it  would  have  been
absurd to try to convince a  government  body  that  any  object  that
brought in so many millions of credits each day was  a  calamity,  and
Siebling didn't even try. And  after  awhile  Siebling  relegated  the
uncomfortable knowledge to the back of his mind, and settled  down  to
the routine existence of Custodian of the Sack.
   Because there was a conversation every twenty hours,  Siebling  had
to rearrange his eating and sleeping schedule to a twenty-hour  basis,
which made it  a  little  difficult  for  a  man  who  had  become  so
thoroughly accustomed to the thirty-hour space day. But he  felt  more
than repaid for the trouble by his conversations  with  the  Sack.  He
learned a great many things about the planets and the system, and  the
galaxies, but he learned them incidentally, without making  a  special
point of asking about them. Because his  knowledge  of  astronomy  had
never gone far beyond the elements, there were some  questions  -  the
most important of all about the galaxies -  that  he  never  even  got
around to asking.
   Perhaps  it  would  have  made  little  difference   to   his   own
understanding if he had asked, for some of the answers were  difficult
to understand. He spent three entire periods with the Sack  trying  to
have that mastermind make clear to him how the  Sack  had  been  able,
without any previous contact with human beings, to understand  Captain
Ganko's Earth language on the historic  occasion  when  the  Sack  had
first revealed itself to human beings, and how it  had  been  able  to
answer in practically unaccented words. At the  end,  he  had  only  a
vague glimmering of how the feat was performed.
   It wasn't telepathy, as he had first suspected. It was an intricate
process of analysis that involved, not only the actual  words  spoken,
but the nature of the ship that had landed, the spacesuits the men had
worn, the way they had walked, and many other factors  that  indicated
the psychology of both the speaker and his language. It was  as  if  a
mathematician had tried to explain to someone  who  didn't  even  know
arithmetic how he could determine the equation of a complicated  curve
from a short line segment. And the  Sack,  unlike  the  mathematician,
could do the whole thing, so to speak, in its head, without paper  and
pencil, or any other external aid.
   After a year at the job, Siebling found it difficult to  say  which
he found more fascinating - those  hour-long  conversations  with  the
almost all-wise Sack, or the cleverly stupid demands of  some  of  the
men and women who had  paid  their  hundred  thousand  credits  fir  a
precious sixty seconds. In addition to the relatively simple questions
such as were asked by the scientists or the fortune hunters who wanted
to know where they could find precious metals, there were  complicated
questions that took several minutes.
   One woman, for instance, had asked where to find her  missing  son.
Without the necessary data to go on, even the Sack had been unable  to
answer that. She left, to return a month later with a vast  amount  of
information, carefully compiled, and arranged in order  of  descending
importance. The key items were given the Sack first, those  of  lesser
significance afterward. It required a little less than  three  minutes
for the Sack to give her the answer that her son was  probably  alive,
and cast away on an obscure and very much neglected part of Ganymede.
   All the conversations that took place,  including  Siebling's  own,
were recorded and the records shipped to a  central  storage  file  on
Earth. Many of them he couldn't understand, some because they were too
technical, others because he didn't  know  the  language  spoken.  The
Sack, of course, immediately learned all languages by that process  he
had tried so hard to explain to Siebling,  and  back  at  the  central
storage file there were expert technicians and linguists who went over
every detail of each question and answer with great care, both to make
sure that no questioner revealed himself as a criminal, and to have  a
lead for the collection of income taxes when  the  questioner  made  a
fortune with the Sack's help.
   During the year Siebling had occasion to observe the correctness of
the Sack's remark about its possession  being  harmful  to  the  human
race. For  the  first  time  in  centuries,  the  number  of  research
scientists, instead of growing, decreased. The  Sack's  knowledge  had
made much research unnecessary, and had taken the edge off  discovery.
The Sack commented upon the fact to Siebling.
   Siebling nodded. "I see it  now.  The  human  race  is  losing  its
independence."
   "Yes, from its faithful slave I am becoming its master.  And  I  do
not want to be a master any more than I want to be a slave."
   "You can escape whenever you wish."
   A person would have sighed. The Sack merely said, "I lack the power
to wish strongly enough. Fortunately, the question may soon  be  taken
out of my hands."
   "You mean those government squabbles?"
   The value of the Sack had increased steadily, and  along  with  the
increased value had  gone  increasingly  bitter  struggles  about  the
rights to its services. Financial interests had  undergone  a  strange
development. Their presidents and managers and  directors  had  become
almost figureheads, with all major questions of policy  being  decided
not by their own study of the facts, but by appeal to the Sack. Often,
indeed, the Sack found itself giving advice to bitter rivals, so  that
it seemed to be playing a game of  interplanetary  chess,  with  giant
corporations  and  government  agencies  its  pawns,  while  the  Sack
alternately played for one side and then the other. Crises of  various
sorts, both economic and political, were obviously in the making.
   The Sack said, "I mean both government squabbles  and  others.  The
competition for my services becomes too bitter. I  can  have  but  one
end."
   "You mean that an attempt will be made to steal you?"
   "Yes."
   "There'll  be  little  chance  of  that.  Your  guards  are   being
continually increased."
   "You underestimate the power of greed," said the Sack.
   Siebling was to learn how correct that comment was.

   At the end of his fourteenth month  on  duty,  a  half  year  after
Senator Horrigan had been defeated for re-election, there  appeared  a
questioner who spoke to the Sack in an exotic language  known  to  few
men - the Prdt dialect of Mars. Siebling's attention had already  been
drawn to the man because of the  fact  that  he  had  paid  a  million
credits an entire month in advance for the unprecedented privilege  of
questioning the Sack for ten consecutive minutes. The conversation was
duly recorded, but was naturally meaningless to Siebling  and  to  the
other attendants at the station. The questioner drew further attention
to himself by leaving at the end of seven  minutes,  thus  failing  to
utilize three entire minutes, which would have sufficed  for  learning
how to make  half  a  dozen  small  fortunes.  He  left  the  asteroid
immediately by private ship.
   The three minutes had been reserved, and could not be  utilized  by
any other  private  questioner.  But  there  was  nothing  to  prevent
Siebling, as a government representative, from utilizing them, and  he
spoke to the Sack at once.
   "What did that man want?"
   "Advice as to how to steal me."
   Siebling's lower jaw dropped. "What?"
   The Sack always took  such  exclamations  of  amazement  literally.
"Advice as to how to steal me," it repeated.
   "Then - wait a minute - he left three minutes early. That must mean
that he's in a hurry to get started. He's going to put the  plan  into
execution at once!"
   "It is already in execution," returned the  Sack.  "The  criminal's
organization has excellent, if not quite perfect,  information  as  to
the disposition of defense  forces.  That  would  indicate  that  some
government official has betrayed his trust. I was  asked  to  indicate
which of several plans was best, and to  consider  them  for  possible
weaknesses. I did so."
   "All right, now what can we do to stop the plans from being carried
out?"
   "They cannot be stopped."
   "I don't see why not. Maybe we can't stop them from  getting  here,
but we can stop them from escaping with you."
   "There is but one way. You must destroy me."
   "I can't do that! I haven't the authority, and even  if  I  had,  I
wouldn't do it."
   "My destruction would benefit your race."
   "I still can't do it," said Siebling unhappily.
   "Then if that is excluded, there  is  no  way.  The  criminals  are
shrewd and daring. They asked me to check about  probable  steps  that
would be taken in pursuit, but they asked for no advice as to  how  to
get away, because that would have been a waste of time. They will  ask
that once I am in their possession."
   "Then," said Siebling heavily, "there's nothing I can  do  to  keep
you. How about saving the men who work under me?"
   "You can save both them and yourself by boarding the emergency ship
and leaving immediately by the sunward route. In  that  way  you  will
escape contact with the criminals. But you cannot take me with you, or
they will pursue."
   The shouts of a guard drew Siebling's attention. "Radio report of a
criminal attack, Mr. Siebling! All the alarms are out!"
   "Yes, I know. Prepare to depart." He turned back to the Sack again.
"We may escape for the moment, but they'll have you. And  through  you
they will control the entire system."
   "That is not a question," said the Sack.
   "They'll have you. Isn't there something we can do?"
   "Destroy me."
   "I can't," said Siebling, almost in agony.  His  men  were  running
toward him impatiently, and he knew that there was no  more  time.  He
uttered the simple and absurd phrase, "Good-by," as if the  Sack  were
human and could experience human emotions. Then he raced for the ship,
and they blasted off.
   They were just in time. Half a dozen  ships  were  racing  in  from
other directions, and  Siebling's  vessel  escaped  just  before  they
dispersed to spread a protective network about the asteroid that  held
the Sack.
   Siebling's ship continued to speed toward safety,  and  the  matter
should now have been one solely for the Armed Forces  to  handle.  But
Siebling imagined them pitted against the Sack's perfectly calculating
brain, and his heart sank. Then something happened that he  had  never
expected. And for the first time he realized fully that  if  the  Sack
had let itself be  used  merely  as  a  machine,  a  slave  to  answer
questions, it was not because its powers were limited to  that  single
ability. The visor screen in his ship lit up.
   The  communications  operator  came  running  to  him,  and   said,
"Something's wrong, Mr. Siebling! The screen isn't even turned on!"
   It wasn't. Nevertheless, they could see on it the chamber in  which
the Sack had rested for what must have been  a  brief  moment  of  its
existence. Two men had entered the chamber, one of  them  the  unknown
who had asked his questions in Prdl, the other Senator Horrigan.
   To the apparent amazement of the two men, it  was  the  Sack  which
spoke first. It said, " 'Good-by' is neither a question nor the answer
to one. It is relatively uninformative."
   Senator Horrigan was obviously in awe of the Sack, but he was never
a man to be stopped by something he  did  not  understand.  He  orated
respectfully. "No, sir,  it  is  not.  The  word  is  nothing  but  an
expression -"
   The other man said,  in  perfectly  comprehensible  Earth  English,
"Shut up, you fool, we have no time to waste. Let's get it to our ship
and head for safety. We'll talk to it there."
   Siebling had time to think a  few  bitter  thoughts  about  Senator
Horrigan and the people the politician had punished  by  betrayal  for
their crime in not electing him. Then the scene on the  visor  shifted
to the interior of the spaceship making  its  getaway.  There  was  no
indication of pursuit. Evidently, the plans of the human beings,  plus
the Sack's last-minute advice, had been an effective combination.
   The only human beings with the Sack at first were Senator  Horrigan
and the speaker of Prdl, but this situation was soon changed.  Half  a
dozen other men came rushing up, their faces grim with suspicion.  One
of them announced, "You don't talk to that thing unless we're  all  of
us around. We're in this together."
   "Don't get nervous, Merrill. What do you think  I'm  going  to  do,
double-cross you?"
   Merrill said, "Yes, I do. What do you say, Sack? Do I  have  reason
to distrust him?"
   The Sack replied simply, "Yes."
   The speaker of Prdl turned white. Merrill  laughed  coldly.  "You'd
better be careful what questions you ask around this thing."
   Senator Horrigan cleared his throat. "I have no intentions  of,  as
you put it, double-crossing anyone. It is not in my nature to  do  so.
Therefore, I shall address it." He faced the Sack.  "Sir,  are  we  in
danger?"
   "Yes."
   "From which direction?"
   "From no direction. From within the ship."
   "Is the danger immediate?" asked a voice.
   "Yes."
   It was Merrill who turned out to have  the  quickest  reflexes  and
acted first on the implications of the answer. He had blasted the  man
who had spoken in Prdl before the latter  could  even  reach  for  his
weapon, and as Senator Horrigan made a frightened dash for  the  door,
he cut that politician down in cold blood.
   "That's that," he said. "Is there further danger inside the ship?"
   "There is."
   "Who is it this time?" he demanded ominously.
   "There will continue to be danger so long as there is more than one
man on board and I am with you. I am too valuable a treasure for  such
as you."
   Siebling  and  his  crew  were  staring  at  the  visor  screen  in
fascinated horror, as if expecting the slaughter to begin  again.  But
Merrill controlled himself. He said, "Hold it, boys. I'll  admit  that
we'd each of us like to have this thing for ourselves, but it can't be
done. We're in this together, and we're going to have some navy  ships
to fight off before long, or I miss my guess. You,  Prader!  What  are
you doing away from the scout visor?"
   "Listening," said the man he addressed. "If  anybody's  talking  to
that thing, I'm going to be around to hear the answers. If  there  are
new ways of stabbing a guy in the back, I want to learn them too."
   Merrill swore. The next moment the ship  swerved,  and  he  yelled,
"We're off our course. Back to your stations, you fools!"
   They were running wildly back to their stations, but Siebling noted
that Merrill wasn't too much concerned about their  common  danger  to
keep from putting a blast through Prader's back before the unfortunate
man could run out.
   Siebling said to his own men, "There can be only one  end.  They'll
kill each other off, and then the last one or two  will  die,  because
one or two men cannot handle a ship that size for long  and  get  away
with it. The Sack must have foreseen that too. I wonder why it  didn't
tell me."
   The Sack spoke, although there was no one in the ship's cabin  with
it. It said, "No one asked."
   Siebling exclaimed excitedly, "You can hear me! But what about you?
Will you be destroyed too?"
   "Not yet. I have willed to live longer." It paused, and then, in  a
voice just a shade lower than before, said, "I do not like  relatively
non-informative conversations  of  this  sort,  but  I  must  say  it.
Good-by."
   There was a sound of renewed yelling and  shooting,  and  then  the
visor went suddenly dark and blank.
   The miraculous form of life that was the Sack,  the  creature  that
had once seemed so alien to human  emotions,  had  passed  beyond  the
range of his knowledge. And with it had gone, as the Sack  itself  had
pointed out, a tremendous potential for harming the entire human race.
It was strange, thought Siebling, that he felt  so  unhappy  about  so
happy an ending.

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