Niven, Larry - Ringworld 2 - The Ringworld Engineers

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THE RINGWORLD ENGINEERS

by Larry Niven

v1.0 (30 sep 2000)

If you find and correct errors in the text, please update the version number by 0.1 and

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DEDICATION

Ringworld is ten years old; and I have never stopped getting letters about it. People have

been commenting on the assumptions, overt and hidden, and the mathematics and the ecology and the

philosophical implications, precisely as if the Ringworld were a proposed engineering project and

they were being paid for the work.

A man in Washington, D.C., sent me a full proofreading job on the first edition of

Ringworld, with the title "The Niven-McArthur Papers, Vol. I." It was of enormous help to me. (If

you own a first paperback edition of Ringworld, it's the one with the mistakes in it. It's worth

money.)

A Florida high school class determined the need for the spillpipe system.

From a Cambridge professor came an estimate for the minimum tensile strength of scrith.

Freeman Dyson (Freeman Dyson!) has no trouble believing in the Ringworld (!), but can't

see why the engineers wouldn't have built a lot of little ones instead. Wouldn't it be safer. I

hope the answer I've given in this book is satisfactory.

Of course there are no petrochemicals on the Ringworld. Frank Gasperik pointed out that

any civilization at our level would be based on alcohol. The Machine People would be able to use

the vegetable sludge for other purposes, up to and including a plastics industry.

During a speech in Boston someone in the audience pointed out that, mathematically, the

Ringworld can be treated as a suspension bridge with no endpoints. Simple in concept; harder to

build.

From all directions came news of the need for attitude jets. (During the 1971 World

Science Fiction Convention, MIT students were chanting in the hotel hallways: THE RINGWORLD IS

UNSTABLE!) but it took Ctein and Dan Alderson, working independently, several years to quantify

the instability. Ctein also worked out data on *moving* the Ringworld.

Dan Alderson was kind enough to work out the parameters for the Ringworld meteor defense

for me ... and that was the *only* piece of information I actually solicited.

You who did all that work and wrote all those letters: be warned that this book would not

exist without your unsolicited help. I hadn't the slightest intention of writing a sequel to

Ringworld. I dedicate this book to you.

CHAPTER 1 -- UNDER THE WIRE

Louis Wu was under the wire when two men came to invade his privacy.

He was in full lotus position on the lush yellow indoor-grass carpet. His smile was

blissful, dreamy. The apartment was small, just one big room. He could see both doors. But, lost

in the joy that only a wirehead knows, he never saw them arrive. Suddenly they were there: two

pale youths, both over seven feet tall, studying Louis with contemptuous smiles. One snorted and

dropped something weapon-shaped in his pocket. They were stepping forward as Louis stood up.

It wasn't just the happy smile that fooled them. It was the fist-sized droud that

protruded like a black plastic canker from the crown of Louis Wu's head. They were dealing with a

current addict, and they knew what to expect. For years the man must have had no thought but for

the wire trickling current into the pleasure center of his brain. He would be near starvation from

self-neglect. He was small, a foot and a half shorter than either of the invaders. He --

As they reached for him Louis bent far sideways, for balance, and kicked once, twice,

thrice. One of the invaders was down, curled around himself and not breathing, before the other

found the wit to back away.

Louis came after him.

What held the youth half paralyzed was the abstracted bliss with which Louis came to kill

him. Too late, he reached for the stunner he'd pocketed. Louis kicked it out of his hand. He

ducked a massive fist and kicked at kneecap, kneecap (the pale giant stopped moving), groin, heart

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(the giant bent far forward, with a whistling scream), throat (the scream stopped suddenly).

The other invader was on hands and knees, breathing in sips. Louis chopped at his neck,

twice.

The invaders lay still in the lush yellow grass.

Louis Wu went to lock his door. At no time had the blissful smile left his face, and it

did not change when he found his door fully locked and alarmed. He checked the door to the

balcony: bolted and alarmed.

How in the world had they gotten in?

Bemused, he settled where he was, in lotus position, and did not move again for over an

hour.

Presently a timer clicked and switched off the droud.

***

Current addiction is the youngest of mankind's sins. At some time in their histories, most

of the cultures of human space have seen the habit as a major scourge. It takes users from the

labor market and leaves them to die of self-neglect.

Times change. Generations later, these same cultures usually see current addiction as a

mixed blessing. Older sins -- alcoholism and drug addiction and compulsive gambling -- cannot

compete. People who can be hooked by drugs are happier with the wire. They take longer to die, and

they tend not to have children.

It costs almost nothing. An ecstasy peddler can raise the price of the operation, but for

what? The user isn't a wirehead until the wire has been embedded in the pleasure center of his

brain. Then the peddler has no hold over him, for the user gets his kicks from house current.

And the joy comes pure, with no overtones and no hangover.

So that by Louis Wu's time, those who could be enslaved by the wire or by any lesser means

of self-destruction had been breeding themselves out of the human race for eight hundred years.

Today there are even devices that can tickle a victim's pleasure center from a distance.

Tasps are illegal on most worlds, and expensive to make, but they are used. (A dour stranger

wanders past, rage or misery written in the sour lines of his face. From behind a tree you make

his day. Plink! His face lights up. For a moment he's got no worries at all ...) They don't

generally rain lives. Most people can take it.

***

The timer clicked and switched off the droud.

Louis seemed to sag in upon himself. He reached across his smooth scalp to the base of the

long black braid, and pulled the droud from its socket beneath the hair. He held it in his hand,

considering; then, as always, he dropped it into a drawer and locked it. The drawer disappeared.

The desk, which seemed a massive wooden antique, was actually paper-thin hullmetal, with endless

room for secret compartments.

It was always a temptation to reset the timer. He'd done it routinely in the early years

of his addiction. Neglect had made of him a skeletal rag doll, constantly dirty. Finally he had

gathered what remained of his ancient dogged determination, and he had built a timer that took

twenty minutes of nitpicking concentration to reset. On its present setting it would give him

fifteen hours of current and twelve hours for sleep and for what he called maintenance.

The corpses were still there. Louis had no idea what to do about that. If he'd called the

police immediately, it would still have attracted unwanted attention ... but what could he tell

them now, an hour and a half late? That he'd been knocked unconscious? They'd want to deep-radar

his head for fractures!

This he knew: in the black depression that always followed his time under the wire, he

simply couldn't make decisions. He followed his maintenance routine like a robot. Even his dinner

was preprogrammed.

He drank a full glass of water. He set the kitchen. He went to the bathroom. He did ten

minutes of exercise, pushing himself hard, fighting depression with exhaustion. He avoided looking

at the stiffening corpses. Dinner was ready when he finished. He ate without tasting ... and

remembered that once he had eaten and exercised and made every move with the droud set in his

skull, delivering a tenth of normal current to the pleasure center. For a time he had lived with a

woman who was also a wirehead. They had made love under the wire ... and played war games and held

pun contests ... until she had lost interest in everything but the current itself. By then Louis

had regained enough of his natural caution to flee Earth.

He thought now that it would be easier to flee this world than to dispose of two large,

conspicuous corpses. But if he were already being watched?

They didn't look like ARM agents. Large, soft in the muscle, pale from a sunlight more

orange than yellow, they were certainly low-gravity types, probably Canyonites. They hadn't fought

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like ARMs ... but they had bypassed his alarms. These men could be ARM hirelings, with friends

waiting.

Louis Wu disarmed his balcony door and stepped out.

***

Canyon does not quite follow the usual rules for planets.

The planet is not much bigger than Mars. Until a few hundred years ago its atmosphere was

just dense enough to support photosynthesis-using plants. The air held oxygen, but was too thin

for human or kzinti life. The native life was as primitive and hardy as lichen. Animal had never

developed at all.

But there were magnetic monopoles in the cometary halo around Canyon's orange-yellow. sun,

and radioactives on the planet itself. The Kzinti Empire swallowed the planet and staffed it with

the aid of domes and compressors. They called it Warhead, for its proximity to the unconquered

Pierin worlds.

A thousand years later the expanding Kzinti Empire met human space.

The Man-Kzin wars were long over when Louis Wu was born. Men won them all. The kzinti have

always had a tendency to attack before they are quite ready. Civilization on Canyon is a legacy of

the Third Man-Kzin War, when the human world Wunderland developed a taste for esoteric weapons.

The Wunderland Treatymaker was used only once. It was a gigantic version of what is

commonly a mining tool: a disintegrator that fires a beam to suppress the charge on the electron.

Where a disintegrator beam falls, solid matter is rendered suddenly and violently positive. It

tears itself into a fog of monatomic particles.

Wunderland built, and transported into the Warhead system, an enormous disintegrator

firing in parallel with a similar beam to suppress the charge on the proton.

The two beams touched down thirty miles apart on Canyon's surface. Rock and kzinti

factories and housing spewed away as dust, and a solid bar of lightning flowed between the two

points. The weapon chewed twelve miles deep into the planet, exposing magma throughout a region

the size and shape of Baja California on Earth, and running roughly east and west. The kzinti

industrial complex vanished. The few domes protected by stasis fields were swallowed by magma,

magma that welled higher in the center of the great gash before the rock congealed.

The eventual result was a sea surrounded by sheer cliffs many miles high, surrounding in

turn a long, narrow island.

Other human worlds may doubt that the Wunderland Treatymaker ended the war. The Kzinti

Patriarchy is not normally terrified by sheer magnitude. Wunderlanders have no such doubts.

Warhead was annexed after the Third Man-Kzin War, and became Canyon. Canyon's native life

suffered, of course, from the gigatons of dust that dropped on its surface, and from the loss of

water that precipitated within the canyon itself to form the sea. In the canyon there is

comfortable air pressure and a thriving pocket-sized civilization.

Louis Wu's apartment was twelve stories up the side of the north face of the canyon. Night

shadowed the canyon floor as he stepped outside, but the southern face still glowed with daylight.

Hanging gardens of native lichen dripped from the rim. Old elevators were silver threads standing

miles high against the cut stone. Transfer booths had made these obsolete for travel, but tourists

still used them for the view.

The balcony overlooked the belt of parkland that ran down the center of the island. The

vegetation had the wild look of a kzinti hunting park, with pink and orange blended into the

imported terrestrial biosphere. Kzinti life was common throughout the canyon.

There were as many kzinti as human tourists down there. The kzinti. males looked like fat

orange cats walking on their hind legs ... almost. But their ears flared like pink Chinese

parasols, and their tails were nude and pink, and their straight legs and big hands marked them as

toolmakers. They stood eight feet tall, and though they scrupulously avoided bumping human

tourists, carefully tended claws slid out above black fingertips if a human passed too close.

Reflex. Maybe.

Sometimes Louis wondered what impulse brought them back to a world once theirs. Some might

have ancestors here, alive in frozen time in the domes buried beneath this lava island. One day

they'd have to be dug up ...

There were so many things he hadn't done on Canyon, because the wire was always calling.

Men and kzinti had climbed those sheer cliffs for sport, in the low gravity.

Well, he would have one last chance to try that. It was one of his three routes out. The

second was the elevators; the third, a transfer booth to the Lichen Gardens. He'd never seen them.

Then overland in a pressure suit light enough to fold into a large briefcase.

On the surface of Canyon there were mines, and there was a large, indifferently tended

preserve for the surviving varieties of Canyon lichen. But most of the world was barren moonscape.

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A careful man could land a spacecraft undetected, and could hide it where only a deep-radar search

would find it. A careful man had. For these past nineteen years Louis Wu's ship had been waiting,

hidden in a cave in the northward-facing cliff of a mountain of low-grade metal ore: a hole hidden

within permanent shadow on Canyon's airless surface.

Transfer booths or elevators or cliff-climbing. Let Louis Wu get to the surface and he was

home free. But the ARM could be watching all three exits.

Or he could be playing paranoid games with himself. How could Earth's police force have

found him? He had changed his face, his hair style, his way of life. The things he loved best were

just the things he had given up. He used a bed instead of sleeping plates, he avoided cheese as if

it were spoiled milk, and his apartment was furnished with mass-produced retractables. The only

clothes he owned were of expensive natural fiber, with no optical effects at all.

He had left Earth as an emaciated and dreamy-eyed wirehead. Since then he had forced a

rational diet on himself; he had tortured himself with exercise and a weekly course in martial

arts (mildly illegal, and the local police would register him if they caught him, but not as Louis

Wu!) until today he was an adequate facsimile of glowing health, with the hard muscles a younger

Louis Wu had never bothered to attain. How could the ARM recognize him?

And how had they got in? No common burglar could have passed Louis's alarms.

They lay dead in the grass, and soon the smell would overpower the air conditioning. Now,

a bit late, he felt the shame of the man-killer. But they had invaded his territory, and there is

no guilt under the wire. Even pain is a spice added to joy, and joy -- like the basic human joy of

killing a thief in the act -- becomes hugely intensified. They had known what he was, and that was

both sufficient warning and a direct affront to Louis Wu.

The kzinti and human tourists and natives milling in the street below looked innocent

enough, and probably were. If an ARM was watching him now, it would be through binoculars, from a

window in one of those black-eyed buildings. None of the tourists were looking up ... but Louis

Wu's eyes found a kzin, and locked.

Eight feet tall, three feet broad, thick orange fur turning gray in spots: he was very

like the dozens of kzinti about him. What caught Louis's eye was the way the fur grew. It was

tufted, patchy, and whitened over more than half the alien's body, as if the skin below were

extensively scarred. There were black markings around his eyes, and the eyes weren't looking at

scenery. They were searching the faces of passing humans.

Louis wrenched himself free of the urge to gape and stare. He turned and went inside, in

no obvious haste. He locked his balcony doors and reset the alarms, and then he dug his droud out

of its hiding place in the table. His hands trembled.

It was Speaker-To-Animals he had seen, for the first time in twenty years. Speaker-To-

Animals, once an ambassador to human space; Speaker, who with Louis Wu and a Pierson's puppeteer

and a very odd human girl had explored a minuscule section of the enormous structure called the

Ringworld; who had earned his full name from the Patriarch of Kzin for the treasure he brought

back. You could die, now, for calling him by a profession, but what was his new name? Something

that started with a cough, like a German ch, or like the warning cough a lion might give:

*Chmeee*, that was it. But what could he be doing here? With a true name and land and a harem

already mostly pregnant, Chmeee had had no intention of leaving Kzin ever again. The idea of his

playing tourist on an annexed human world was ridiculous.

Could he possibly know that Louis Wu was in the canyon?

He had to get out, now. Up the canyon wall to his ship.

And that was why Louis Wu was playing with the timer in his droud, squinting as he used

tiny instruments on tiny settings. His hands trembled irritatingly ... The timing would have to be

changed anyway, now that he was leaving Canyon's twenty-seven-hour day.

He knew his target. There was another world in human space whose surface was largely

barren moonscape. He could land a ship undetected in the vacuum at the West End of Jinx ... and

set the timing on the droud now ... and take a few hours under the wire now to nerve himself. It

all made perfect sense. He gave himself two hours.

***

Almost two hours passed before the next invader came. Rapt in the joy of the wire, Louis

would not have been disturbed in any case. He found the invader something of a relief.

The creature stood solidly braced on a single hind leg and two wide-spaced forelegs.

Between the shoulders rose a thick hump: the braincase, covered by a rich golden mane curled into

ringlets and glittering with jewels. Two long, sinuous necks rose from either side of the

braincase, ending in flat heads. Those loose-lipped mouths had served the puppeteers as hands for

all of their history. One mouth clutched a stunner of human make, a long, forked tongue curled

around the trigger.

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Louis Wu had not seen a Pierson's puppeteer in twenty-two years. He thought it quite

lovely.

And it had appeared from nowhere. This time Louis had seen it blink into existence in the

middle of his yellow grass rug. He had worried needlessly; the ARM had not been involved at all.

The problem of the Canyonite burglars was solved.

"Stepping discs!" Louis cried joyfully. He launched himself at the alien. This would be

easy, puppeteers were cowards --

The stunner glowed orange. Louis Wu spilled onto the carpet, every muscle limp. His heart

labored. Black spots formed before his eyes.

The puppeteer stepped delicately around the two dead men. It looked down at him from two

directions; and then it reached for him. Two sets of flat-topped teeth clamped on his wrists, not

hard enough to hurt. The puppeteer dragged him backward across the rug and set him down.

The apartment vanished.

It could not be said that Louis Wu was worried. He felt no such unpleasant sensation.

Dispassionately (for the uniform joy in the wire allows an abstraction of thought normally

impossible to mortals) he was readjusting his world picture.

He had seen the system of stepping discs on the Pierson's puppeteers' home world. It was

an open teleportation system, far superior to the closed transfer booths used on the human worlds.

Apparently a puppeteer had had stepping discs installed in Louis's apartment; had sent two

Canyonites to fetch him; when that failed, had come himself. The puppeteers must want him badly.

That was doubly reassuring. The ARM was not involved at all. And puppeteers had a million

years of tradition to back their philosophy of enlightened cowardice. They could hardly want his

life; they could have had it more cheaply, with less risk. He should find it easy to cow them.

He was still lying on a patch of yellow grass and binding mat. It must have been sitting

on the stepping disc. There was a huge orange fur pillow across the room from him ... no, it was a

kzin slumped with his eyes open, asleep or paralyzed or dead -- and in fact it was Speaker. Louis

was glad to see him.

They were in a spacecraft, a General Products hull. Beyond the transparent walls space-

bright sunlight glared off sharp-edged lunar rocks. A patch of green-and-violet lichen told him he

was still on Canyon.

But he wasn't worried.

The puppeteer released his wrists. Ornaments glittered in its mane: not natural jewels,

but something like black opals. One flat brainless head bent and pulled the droud out of the plug

in Louis's skull. The puppeteer stepped onto a rectangular plate and vanished, with the droud.

CHAPTER 2 -- PRESS GANG

The kzin's eyes had been watching him for some time. Now the paralyzed kzin cleared his

throat experimentally and rumbled, "Loo-ee Woo."

"Uh," said Louis. He had been thinking of killing himself, but there was no way. He could

barely wiggle his fingers.

"Louis, urr you wirehead?"

"Ungle," said Louis, to buy time. It worked. The kzin gave up the effort. And Louis --

whose only real concern was for his missing droud -- Louis followed an old reflex. He looked

around him to learn just how bad his situation was.

The hexagon of indoor grass under him marked the stepping-disc receiver. A black circle

beyond would be the transmitter. Otherwise the floor was transparent, as were the portside hull

and the aft wall.

The hyperdrive shunt ran nearly the length of the ship, beneath the floor. Louis had to

recognize the machinery from first principles. It was not of human manufacture; it had the half-

melted look of most puppeteer construction. So: the ship had faster-than-light capability. It

seemed he was slated for a long trip.

Through the aft wall Louis could see into a cargo hold with a curved hatch in the side.

The hold was nearly filled by a skewed cone thirty feet tall and twice that long. The peak was a

turret with ports for weapons and/or sensing instruments. Below the turret, a wraparound window.

Lower still, a hatch that would drop to form a ramp.

It was a lander, an exploration vehicle. Human-built, Louis thought, and custom-built. It

had none of that half-melted look. Beyond the lander he glimpsed a silver wall, probably a fuel

tank.

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file:///G|/Program%20Files/eMule/Incoming/Larry%20Niven%20-%20Ringworld%2002%20-%20The%20Ringworld%20Engineers.txtTHERINGWORLDENGINEERSbyLarryNiven(c)1980byLarryNivenv1.0(30sep2000)Ifyoufindandcorrecterrorsinthetext,pleaseupdatetheve sionnumberby0.1andredistribute.DEDICATIONRingworldistenyearsold;...

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