Science Fiction in Pseudoscience
Austin Society to Oppose Pseudoscience
The term "science fiction" was invented to
describe a certain genre of literature popularized in the 1920s, when pulp
fiction magazines specializing in this type of fiction first appeared. But as a
genre of popular literature, under no particular name, science fiction is found
in general fiction magazines throughout the 19th Century. Many of the themes
invented by writers 100 to 150 years ago have penetrated the public
consciousness so thoroughly that pseudoscience writers need only mention one or
two key words to suggest a whole scenario in the mind of the reader! What is
really frightening, however, is that the average reader probably thinks these
familiar concepts borrowed from nearly two centuries of fantasy fiction are
actual, well-established scientific fact
real phenomena of the real world! In
fact, the vast majority of these science fiction themes are fictional clichιs
without any fixed meaning, much less any correspondence to anything in the real
world.
Let's discuss some of the more common themes that
appear in 19th century fantastic fiction. These include:
LOST CIVILIZATIONS. The usual story goes
that an explorer stumbles onto a "lost" civilization in some isolated part of
the world; a high urban civilization that has no contact or communication
whatsoever with the rest of the world, is geographically isolated by jungles or
mountains, and, often, possesses a high technology. In the 19th Century this
fictional clichι, particularly exploited by British novelist H. Rider Haggard,
was a pleasant enough conceit, but it makes little sense today, with the globe
so thoroughly explored. Furthermore, the concept of an advanced but totally
isolated civilization has been widespread trade and frequent cross-cultural
contacts. In 19th century fiction, the hero generally falls in love with the
local princess and gets her out of the country just as a volcano or something
similar destroys the civilization forever.
NEW ANIMALS, BOTH FOUND AND MADE.
This was an especially popular theme in the latter part of the 19th century.
Still-surviving dinosaurs could be found on a remote plateau in South America,
as in The Lost World, by Sir Arthur Conan Doyle; familiar small animals
could be made unrecognizably gigantic, as in The Food of the Gods, by H.
G. Wells; or animals could be surgically turned into human beings, as in The
Island of Dr. Moreau, also by Wells. Hence our inheritance of two familiar
themes: those supposedly extinct animals are hiding out somewhere, and those
meddling scientists can create monsters to menace us. Public fears of and legal
interference with modern genetic engineering experiments probably stem mainly
from such fantasies, not from any real threat or menace.
MECHANICAL LIFE -- ROBOTS AND ANDROIDS.
Many writers explored this theme during the latter half of the 19th century,
often as a social satire on the ultimate influence of assembly lines --
assembling peoples rather than products. In 20th Century science fiction the
terms "robot" and "android" have clearly established meanings of which movie
script writers and many others seem to be totally ignorant. A robot
is any machine which can do all or some of the work of a man without human
supervision. An android is an artificial human; it can operate mechanically or biochemically, but it is manufactured. The concept of mechanical life grew up
out of the fad for clockwork automatons that continued from themid-18th to
mid-19th century. Typical is the Ambrose Bierce story, Moxon's Master, in
which a mechanical chess player ultimately murders its designer.
VISITORS FROM OTHER PLANETS. This is
probably the single most familiar theme from science fiction. As soon as people
suspected that life is a natural phenomenon, which may appear anywhere
conditions are right, and that the other planets are worlds like earth, the
possibility that intelligent creatures from other planets might visit us became
a common topic of discussion. Sometimes the visitors of fiction were peaceful
and came to Earth seeking knowledge; other times they were desperate and/or
warlike, and came to earth seeking conquest. Reality is quite different. There
is no evidence whatsoever that creatures from any other world have ever visited
Earth, and our increasing knowledge of the other planets of our solar system --
none of which is suitable for life -- makes clear why we haven't been visited.
Visits from other solar systems are an extremely remote possibility, in view of
the vast distances between stars with solar systems and the vast numbers of such
systems to choose from.
VISITS TO OTHER PLANETS. This tradition in
literature goes back nearly 2,000 years, but only in the 19th century did
writers of such stories generally try to describe the other planets as they
actually were thought to be, rather than as imaginary Cloud-coocoolands in which
anything was possible. Nineteenth century fiction about visits from and to other
planets had a strong influence on the 19th century pseudoscientific religion of
Theosophy, and through it on much of 20th century pseudoscience. (Did you know,
for instance, that the Earth was once colonized from Venus?!? Or that Atlantis
had a death ray?!?)
TIME TRAVEL INTO THE PAST. There is no
debate, even among science fiction writers, that this is completely impossible.
It not only involves violations of the laws of physics, particularly the Second
Law of Thermodynamics, but literally and actually involves gross logical
contradictions. The idea is that mad Dr. Soandso gets into his time machine (not
clearly described) and somehow goes back to ancient Rome, where he gives a
translated handbook of physics and chemistry to a Roman scholar, and thus
utterly changes the course of human history
the atomic bomb, for instance, is
then invented by Claudius Festus Arpinna in 350 AD. Despite the fact that even
the writers agree time trips into the past are an impossibility, they love to
play with them, because of the plot complications that can be generated by the
logical contradictions that arise. My favorite books of this type are
Dinosaur Beach by Keith Laumer and The End of Eternity by Isaac
Asimov. The time-travel short story to end all time-travel short stories is
All You Zombies! By Robert A. Heinlein. Wells' 19th Century The Time
Machine is the genre's daddy.
SUSPENDED ANIMATION OR TIME TRAVEL INTO THE
FUTURE. Nothing impossible about this, and a pseudoscientific rewrite of the
Rip Van Winkle plot was the easiest way for a writer to get his 19th century
Every man into the Utopian future to comment, marvel, and react. A classic
example is Wells' When the Sleeper Wakes. However, travel into the future
(possible -- in fact, unavoidable!) is not much fun unless you can return to the
past to tell the home folks what you saw (impossible).
INVISIBILITY. This theme was ever popular
in the 19th century -- Well's novel about the Invisible Man, or Bierce's
short story about a man eaten alive by an invisible animal, are typical. Again,
this is a physical impossibility. In order to be invisible, an object would have
to have two characteristics, which are totally unrelated. It would have to be
transparent, and would also have to have an index of refraction that is
exactly equal to that of air. A transparent object (like glass or quartz) is
not invisible, because it does not have the same index of refraction as air. But
in fact no solid object (or liquid object) can have an index of refraction
anywhere close to that of any gas at normal temperature and pressure. What is
more, air does not have a fixed index of refraction
it varies with pressure,
temperature, etc. But all solids and liquids have fixed indices of refraction.
To show that the idea of invisibility involves practical contradictions, imagine
an invisible boat. A transparent boat with the same index of refraction
as water would be clearly visible in air (as is a splash of water), and thus
"invisible" only below the water line. If we instead made it have the index of
refraction of air, the part below the water line would be clearly visible (like
an air bubble in water). Also, a boat made of a transparent material, like
glass, would not be too seaworthy! In the laboratory, one can find liquids,
which have the same index of refraction as certain glasses. If a piece of such
glass is completely immersed in such a liquid, it cannot be seen
(although it would easily be felt by putting one's fingers in the liquid) -- but
it would show up on radar or sonar. This does not seem too practical!
Note also the following: in general, there is no
way to make a material that is not transparent. Transparency is a more-or-less
intrinsic property of objects, determined by the way the atoms or molecules of
the object are bonded to one another. A final comment: an invisible creature
would also be blind! Eyes work by absorbing light.
"THE FOURTH DIMENSION." The general claim
is that there are "other" space dimensions, somehow at right angles to the three
we know, and if we could "learn" to move in these other dimensions (usually only
one other, the fourth) we could do apparently supernatural things, like
instantaneously travel from one spot to another, penetrate solid through solid,
etc. The fact that all forces whose ranges are not otherwise limited fall off
with distance exactly as the inverse square, to a very great measured accuracy,
indicates directly that there are no more than three space dimensions available
to matter and to forces
and everything in the universe is made of matter and
acted on by the same four forces. Physicists and mathematicians routinely work
in abstract spaces of arbitrary numbers of dimensions
even infinite numbers of
dimensions. Further, modern efforts to unify the electromagnetic, weak, and
strong nuclear forces, which are understood quantum physically, with gravity,
which is understood only classically, sometimes involve working with many actual
space dimensions, 8 or more. This is a mathematical trick to make an incomplete
theory generate possibly realistic numbers, and has nothing to do with the
actual number of space dimensions. In these theories, called "supersymmetric
theories," all higher dimensions have to be made compact, curled up on
themselves, so that particles cannot move or forces propagate along them,
otherwise the theories would not work at all! These theories are just things for
physicists to play with until they find a quantum theory of gravity, and have no
particular physical significance at present.
An obvious comment is that if actual higher
dimensions did exist, nothing could "prevent" matter, forces, or us from moving
in those directions to begin with, and we would know about them from the
beginning, just as we know about forward, sideways, and up.
COEXISTENT WORLDS. These are usually
confused by pseudoscientists with the "fourth" dimension and "parallel" worlds,
two totally unrelated ideas. The original 19th Century fantasy fiction theme of
coexistent worlds is that since we see only a very limited part of the full
electromagnetic spectrum, maybe there are features of the world of which we are
unaware
for instance, if we could see by ultraviolet light maybe New York City
would also be a jungle! We wouldn't be aware of the jungle since it can be seen
only in ultraviolet light. If this claim makes sense to you, you have a lot to
learn about nature. In each of the last three themes, writers almost always
confuse "invisibility" with "intangibility." A blind man can't see the
curbstone, but that doesn't prevent him from tripping over it! An object, which
could not be seen, could still be felt, and its existence would be obvious!
Furthermore, an object, which reflected only ultraviolet light, for instance,
would be clearly visible. Why? An object, which does not reflect visible
light, appears black to our eyes. A jet-black tree is just as visible as a
regular tree, at least in the daytime.
VIBRATIONS. Physicists in the 19th Century
were very interested in vibrations and waves. Writers of popular fiction, and
pseudoscientists, took only these words, and used them as buzz words. (A
buzzword is a word, which is meaningless in context, and usually is applied too
broadly to so many things that no meaning could possibly be assigned to
it in its customary -- non-scientific -- applications.) Thus writers started
saying things like "everything is made of vibrations, and the only difference
between one thing and another is the rate at which is vibrates, its frequency.
If I could change my vibration rate to that of platinum metal, I would become
platinum metal." This is the 19th Century origin of the 20th century buzz word
"vibes." "The vibes are not right today for me to do this job." It makes no more
sense to say that things are "made of" vibrations than it does to say they are
made of "sidewise motions" (what is moving?) or that they are made of
"temperature" (what has the temperature?). Matter is made of atoms. Atoms may or
may not vibrate; it's the atoms and their properties that are important.
ENERGY. Nineteenth century physicists
were also extremely interested in the concept of energy. In physics, "energy" is
a bookkeeping device for keeping track of the amount of work that has been done
on or by a system. In popular fiction, "energy" became a buzzword, and finally a
kind of substance. Science fiction writers and pseudoscientists today talk about
things made of "pure energy." Since temperature, for instance, is a direct
measure of internal kinetic energy, to say something is "pure energy" makes no
more sense than to say something is "pure temperature." This is gibberish,
without any connection to the world we live in. Energy is not a substance or a
thing. It is a number (with units of work) and it is not the number of anything.
PARALLEL WORLDS. Another ever-popular idea
from 19th century fiction was, "what if?" What if the South had won the Civil
War? What if Napoleon had not invaded Russia? Characters were struck by
lightning or something and woke up in another world in which history had taken
some other turn. It makes a good novel, but it has nothing to do with the world
we live in. In its purest form, this is a naοve "concrete" interpretation of the
abstract concept of probability
the claim that if the coin is 50% likely to
fall heads, and 50% likely to fall tails, it has to do both
the universe
splits into two universes, in one of which the coin falls heads, in the other of
which it falls tails. Since almost everything that happens in the universe is a
matter of probability, and since an almost limitless number of processes are
taking place in each split second, one is talking about an almost limitless
number of "new" universes being born every split second. Of course, one can talk
about anything. There is, however, nothing in the real world corresponding to
the concept of parallel worlds. In modern physics one does encounter what are
called "multiple vacua." The present state of the universe is not the only
possible state. For all we know the whole universe could suddenly make a "phase
transition" to a different vacuum, in which all the fundamental constants and
laws of nature would be totally different, and things as we know them would
cease to exist. But this possibility has nothing whatsoever to do with the
concept of "parallel universes," which are instead more often confused with
"higher dimensions," "coexistent worlds," etc. A good 20th century science
fiction novel dealing with parallel worlds is Keith Laumer's Worlds of the
Empirium; see also H. Beam Piper's "Pratime" series.
DETACHABLE "MIND." What if we could
transfer your mind into the body of a spider? Or my mind into the body of a
whale? Makes for a good 19th or 20th century fantasy story or satire, but what
on earth are we talking about? Not brain transplants. Some swami makes a
mumbo-jumbo incantation -- the movie All of Me features a classic example
-- and minds shuffle around among bodies like cards. What does the word "mind"
mean anyway? What the writers did is to take the ancient religious concept of
"soul," rename it "mind," and go on from there. Again, there's no connection to
reality at any point. But it's now a common teaching in pseudoscience that you
can "learn" -- there's that word again, and it's just $250 for easy lessons if
you act today! -- To detach your mind from your body and send it out to visit
distant places. Sounds like a primitive scenario to account for the very natural
phenomenon of dreaming.
REALITY AS MENTAL IMAGE. Another popular
theme of 19th century fantasy fiction was to have a character realize that his
inner thoughts could reshape the whole universe
by thinking that everyone
should have two heads, he somehow causes everyone to instantly and from then on
have two heads. H. G. Wells wrote a fine story along these lines, entitled
The Man Who could Work Miracles, and 20th century writers have used it too,
as did Ursula LeGuin in The Lathe of Heaven.
As far as reality is concerned, however, it is one
of the most obvious facts of our experience that the universe goes on totally
independent of our thoughts, desires, dream, and fancies. The fact that a
dimwitted cook doesn't know what temperature water boils at, or thinks water
boils at 50° F, does not alter the
boiling temperature of the water on the cookstove. The original 19th century
nonsense has been re-treaded many times, and most recently has shown up in
crackpot "popularizations" of quantum physics or in books about "mystical
physics," in which it is claimed that physicists have shown that "your mind
creates your own reality," and similar vague gobbledygook. What goes on in the
human brain has no more effect on what goes on inside the Sun than what goes on
inside the Sun has on what goes on inside the human brain. How various processes
affect one another is the precise thing that physicists do study. There is no
question, experimentally, that thoughts alone do not affect processes
going on outside the body.
CIVILIZATION AS PERIODIC. When in the 19th
century people began to realize the earth was millions of years old (actually
it's billions of years old), but knew little or nothing about biology and
evolution, they said things like, "But recorded history only goes back a few
thousand years! What were humans doing the rest of that time?" In fact, humans
didn't even exist for most of earth's history, as was clearly understood by the
end of the 19th century. But writers and pseudoscientists were going strong with
the theme of civilizations rising and falling, rising and falling. Half a
million years ago some great civilization had TV and microwave ovens and girls
whom could kick off clothes even faster than Bo Derek. But that civilization
fell, and humans reverted to savagery, and then a long climb began up to our
present civilization, which will also fall, etc. There is no question but that
this idea is totally wrong as it applies to the past. There is not one shred of
archaeological evident of any past civilization with a technology anything like
our own. The archaeological record is wholly consistent with the usual idea that
urban civilization is only about 10,000 years old at most. (The human race
itself, in its present form, is only around 50,000 years old
and for most of
its existence lived a semi-nomadic, hunter-gatherer lifestyle.)
WE'RE PROPERTY. If there were creatures on
other planets that were much more advanced that we are -- a very familiar idea
in the 19th century -- they might not even consider us intelligent, much less
civilized. Maybe they consider us like domestic animals on a far
or like
exhibits in a zoo. Maybe they own us, tend us secretly, cull out fat specimens
and eat them. Lots of good stories have been written about this, and early 20th
century pseudoscientist Charles Fort got a number of books out of the theme. But
alas, there is no evidence whatsoever of visitors from other planets, advanced
or otherwise, benign or malevolent. The other problem is why visitors from other
planets should have any attitude toward us at all, pro or con. What's your
attitude toward the squirrels in your back yard? Or the ants? Or the crickets?
If they don't bother you, you probably don't even notice -- much less bother --
them. And they're right in your backyard, not 100 light years away.
Early 20th century science fiction writers did not
add that many new themes. The four most often encountered are:
THE ATOM AS A LITTLE SOLAR SYSTEM
OR, OUR
SOLAR SYSTEM AS A GIGANTIC ATOM. This is based on a public misunderstanding
of very early, primitive work on the structure of the atom. In Bohr's early,
pre-quantum model, electrons orbit the nucleus of the atom vaguely like planets
orbit the sun. But this picture of the atom is not correct. An atom is
absolutely nothing like a solar system; electrons are absolutely nothing like
planets. The classical physical laws obeyed by planets are totally different
from the quantum-physical laws obeyed by atoms and their constituents. This is a
classic instance of a completely false analogy.
MATTER TRANSMITTERS. I don't know who
invented this concept, but it was probably Ralph Milne Farley in the 1920s with
his RADIO MAN series. The idea is familiar from the later use in TV fantasy
shows like STAR TREK. Somehow your body is scanned and recorded -- and in the
process presumably destroyed. Then the information is transmitted some vast
distance and the body reconstructed somehow from the information available,
using raw materials lying around in the new location. That this is not just
difficult but essentially impossible can easily be seen. There are about 10(28)
atoms in a human being. Suppose that the position of each atom could be measured
in about the time it takes light to cross an atom -- that is as fast as it could
possibly be done, assuming the measuring device literally peels away the body
and so is literally in contact with each atom it measures. The time for light to
cross an atom is about 10-18 seconds. So to scan a human body would take about
10(28) x 10.18 sec or about 300 years! To reconstruct the body at the other end,
again as fast as possible, would take the same length of time. Furthermore the
reconstructed body would be just that
it would not be the original individual
who was destroyed more that 6 centuries before, at the other end of the
transmitter. Any activity of the brain that involves dynamic behavior -- steady
currents, makes and breaks of contact, etc. -- would not get recorded. Only
information stored in the form of specific molecules would get across. In short,
the reconstructed body might have some of the memories of the original
individual, but might not have all of his personality, training, etc.
or any
of it.
SPACE WARP, HYPERSPACE, OR STAR DRIVE. Interstellar
travel is not too practical a prospect, because to travel any significant
fraction of the radius of our own galaxy would require thousands of years
traveling as fast as one can go, just under the speed of light. Science fiction
writers have invented various totally imaginary ways to get around this problem
so that they can use the usual cowboys and Indians plots. You can't rescue
Princes Layya from Barf Tater if it takes 300 years to find out he has her and
400 years to get to where she's held prisoner. Layya and Barf would presumably
be long gone by the time Luke Starkicker got on the scene with his faithful
robot companion DO-2-U-2. Apparently the first writer to consciously avoid this
problem was E. E. ("Doc") Smith, back in the 1920s -- probably because he was
also the first writer to do much with the concept of interstellar travel, in his
famous Skylark and Lensman series. "Doc" solved the problem by
asserting that his space ships could be made inertialess -- and thus (according
to "Doc") could in their inertialess state travel effortlessly at huge multiples
of the speed of light. In fact, however, an object without inertial mass (for
instance a photon or neutrino) must travel at precisely the speed of
light, neither faster nor slower, at all times. "Doc," for purposes of his
stories, was also unclear about how one "goes inertialess," since inertia is an
intrinsic property of matter.
Later writers sought to avoid these and other
problems with physical law by literally "writing" their way from one star to
another; that is, by cloaking the problem with a "solution" of swell-sounding
gibberish terms. The standard solution is that the space ship somehow enters an
alternate universe ("hyperspace") where almost infinite speeds are possible.
Terms like hyperspace and space warp, common in science fiction literature since
the 1930s, have become familiar recently to millions of illiterates via their
use in fantasy TV shows and movies involving interstellar travel. Anyway, the
space ship "makes the jump to hyperspace," or "warps space," and then when it
gets near (?) its destination (?) -- how it navigates is unknown and unspecified
-- it comes back into "regular space." Now, this is all total gibberish, with no
connection to the real universe in which we live. Even considered as an abstract
scenario, it contains internal contradictions. Why should there be any relations
between position in "hyperspace" to position in "real space?" Just moving
straight up into the air ("making the jump to the third dimension") doesn't get
you from Rome to Buenos Aires. Indeed, the entire concept of dimensions is based
on the fact that motion along one dimension is independent of motion along any
other dimension! And how does one go into hyperspace
or warp space
or
construct a star drive that "clutches at the very fabric of space itself?" The
writer, at his typewriter, has no troubles. He can make up any convenient rules
he wants, however inconsistent. But in our real universe the rules are not so
flexible. The fact remains, if you want to go from one point in the universe to
another point, you cannot go at a speed faster than 186,000 miles per second,
period.
ESP, PSYCHIC POWERS; PSIONICS. Two themes
became so immensely popular in the 1950s that they almost completely dominated
science fiction for more than a decade. The first theme was the aftermath of a
global thermonuclear war, with a world sunk back into savagery and inhabited by
weird, dangerous mutants. The second theme was the awakening of fantastic,
generally godlike human mental powers. This latter theme has been so popular
that fiction writers, movie scripters, pseudoscientists and newspaper reporters
tend to forget that no such powers have ever been demonstrated in any
real laboratory inhabited by real scientists. Popular fiction from the very
first has been full of mysterious individuals with godlike powers -- the same
powers possessed by the gods themselves in the various mythologies associated
with the world's popular religions. In the 19th century, two new
religions, Spiritualism and Theosophy, summarized conveniently, and named or
renamed, the powers that the gods would have -- but that we poor humans never
seem to possess. These powers include the ability to read minds, telepathy;
the ability to foresee the future, precognition; the ability to "see"
what is behind windowless walls and within locked drawers, clairvoyance;
the ability to move or alter objects without touching them, by sheer "mental
force," psychokinesis; the ability to cause oneself to vanish at one spot
and instantaneously appear at another, teleportation; the ability to
"take over" another's body, animating it and "looking out of" its eyes and other
senses, possession; and so on. As has been pointed out many times, the
only thing these imaginary powers have in common is their tendency to recur in
the daydreams of frustrated adolescents. "If I could only
. " "I wish I could
" "Boy, if I could
" Pretending that such powers "really do" exist, although
we of course don't have them yet
or rather we aren't trained
is
merely wish fulfillment, of a rather pathetic kind. In the 1930s, the catchall
term ESP (Extra-Sensory Perception) was adopted for all these powers, a rather
poor name since many of them don't involve perception. Thus science fiction
writers introduced another term, psi powers. The imaginary science of
such powers was then called "Psionics." People with ESP were called "esp-ers"
and so on.
The two themes of post-nuclear war and psi powers
sometimes blended, as in stories where imaginary mutants created by peacetime or
wartime radiation developed such powers. Or the human race was depicted as
evolving toward such powers. Indeed, a standard science fiction picture of a
highly advanced or highly evolved race, since the 1930s, give them not only the
physical but also the mental powers attributed in mythology to the gods
themselves. This saves any necessity for the science fiction writer to exercise
any imagination or originality, regarding what an "advanced race" would really
be like.
IN CONCLUSION: The great danger of all the
things we have discussed here is that some people tend to accept everything that
appears in works of fiction, no matter how far fetched, as somehow "real," as if
the authors of the stories have no imaginations, no tradition of fantasy and
religious theme to draw on, and no ability to invent things of their own.
Science fiction is in no way science fact; it is a literature of entertainment,
not of instruction. There is little or no science involved in the usual science
fiction story, which since the 1950s ha anyway turned increasingly on political
and social issues. Even the handful of writers who do know a little about
science -- such as Hal Clement, Poul Anderson, and Arthur C. Clarke -- will
always ignore unpleasant facts if they get in the way of the plot or the
characters. Any fiction writer is out to interest you, then to entertain you and
amuse you. He does not try to function as a scientist or as a teacher; he does
not feel any obligation to depict the actual universe in which we live, and
generally he does not depict such a universe.
Sadly, pseudoscientists regularly take advantage
of public familiarity with the common themes of science fiction, just as they
regularly take advantage of the public's ignorance of most real scientific facts
and authentic science discoveries.
Acknowledgments
ASTOP -- The Austin Society
to Oppose Pseudoscience -- has prepared fact sheets on various topics for the
benefit of teachers and others interested in promoting critical thinking. Dr.
Rory Coker, Professor of Physics at the University of Texas at Austin, is the
author of this fact sheet. The International Cultic Studies Association
(formerly American Family Foundation), a professional research and educational
organization concerned about the harmful effects of cultic and related
involvements, prints and helps distribute these
fact sheets. Because ASTOP fact sheets seek to stimulate critical thinking,
rather than advance a particular point of view, opinions expressed are those of
the authors. These fact sheets may be copied for educational purposes, but
they may not be reproduced for resale.