Unit 01 · Passage 1
Why a pigeon reads an office block as a cliff
Feral pigeons are descended from a cliff-nesting bird that never lived in a forest. This single fact explains most of what a city does to them. A ledge on an office block is a cliff to such a bird. It is dry, it is high, and nothing can climb to it. The birds did not adapt to buildings. We built their old home again, by accident, a million times over. That explains the numbers but not the complaints. The trouble people describe is rarely the bird itself. It is the droppings, which are acidic enough to eat stone because a cliff bird never had to keep a nest clean. Cities that took the complaints seriously stopped poisoning and started closing ledges. Netting a cathedral costs more than a season of poison and works for thirty years. Poison removes birds; it does not remove cliffs. The population returns in a year because the habitat never left. Nothing about the birds had to change.
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Unit 01 · Passage 2
The falcon nobody invited, and the food we had already put out
The fastest animal on earth now nests on bank towers. Nobody put it there. A peregrine hunts by dropping onto a bird in open air. It needs height, a clear view and something to eat below. Height is the only requirement a mountain used to satisfy. A city offers all three, and offers the third in enormous quantity. That quantity is the part people find uncomfortable. The prey is the pigeon of the previous story, and the falcons arrived because we had already fed them. The birds followed the food, as birds have always done. One accidental habitat produced another. This chain is why single-species plans keep failing. A council that removes the pigeons removes the falcons within two seasons, and then explains to the newspapers that the falcons left for reasons of their own. They did not. Nobody planned either half of it, and nobody can undo one half alone. A city is one machine and every part of it is fastened to the next.
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Unit 02 · Passage 1
A track width nobody chose and everybody kept
Nobody voted for the width of a railway track. It was decided by a wheelwright and then by everybody else. An early line in the north used a gauge copied from a colliery wagon. The gauge was not chosen for any engineering reason. It was simply the width the carts in that valley already were. Nothing about it was written down at the time. That accident became expensive once a second company laid track beside the first. Goods had to be lifted out of one wagon and into another at every border. The cost of that lifting eventually bought agreement. The agreement, when it came, did not pick the best width. It picked the one already under the most track. Nobody in the room preferred it. Standards are settled this way far more often than by committee, and the winner is usually whatever is hardest to move. A better idea arriving later has to beat the cost of digging up a continent.
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Unit 02 · Passage 2
Eight feet wide, because of one company's lorries
A shipping container is eight feet wide for a reason nobody now defends. The reason was a lorry. A trucking company in the 1950s had a fleet built to one road law. Its owner wanted boxes that fitted those lorries and cranes that lifted those boxes. Two of his engineers argued for a wider box and lost. He never intended to design a world. The design escaped the company within a decade. Ports that installed the cranes could only receive that box, and shipping lines that wanted those ports had to build for it. Nothing forced the second port to copy the first, except the price of not copying it. Each new port made the next choice easier and the alternative more expensive. The box is now the unit that world trade is measured in. Ships, cranes, bridges and warehouses were all built to a road law from one American state. Nobody would choose that number today. Nobody can afford to change it either.
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Unit 03 · Passage 1
Ninety seconds of surgery, and what removing the pain revealed
Surgery was survivable long before it was safe. A skilled surgeon in 1870 could remove a limb in ninety seconds. Speed was the whole of the technique, because there was nothing to stop the pain and nothing to stop the infection. Anaesthesia arrived first, in the 1840s, and it made everything worse. A surgeon who no longer had to hurry operated for an hour instead of a minute. He also opened the abdomen, which nobody had dared before. Deaths from infection therefore rose in exactly the decade when pain was defeated. Longer operations and deeper wounds gave bacteria more of everything they needed. Antiseptic practice closed the gap twenty years later. Carbolic acid on the instruments cut the death rate by two thirds in a single ward. The lesson is older than the technique. An improvement that removes one limit usually reveals the next one, and the next one is often larger. Nobody in 1850 could have named the second limit.
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Unit 03 · Passage 2
The nurse who won the argument by drawing it
Florence Nightingale is remembered as a nurse. She was, among other things, a statistician. The distinction matters because the second skill is what changed the wards. The hospital she arrived at in 1854 was killing more soldiers than the battle was. Her first reports were ignored. Numbers in a table do not argue. A table asks the reader to do the work. So she drew them. Each wedge of the diagram stood for a month, and the shaded part stood for deaths that a clean ward would have prevented. A minister who would not read forty pages understood the picture in four seconds. The wards were rebuilt within two years. Deaths fell from forty-two per cent to two. The statistics had been true the whole time. What changed was the number of seconds a busy man needed in order to see them. Evidence that cannot be seen quickly is evidence that loses. Nothing about the ward changed before the drawing did.
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Unit 04 · Passage 1
Ninety per cent receipts, and the poem that took six centuries
Writing was not invented to record stories. It was invented to count sheep. The oldest tablets from Uruk are receipts. Ninety per cent of the first written documents list quantities of grain, beer and livestock. The clay was cheap and the mistakes are still legible. Nobody wrote a poem for another six hundred years. Six centuries is a long apprenticeship. During it the marks changed from pictures of things into signs for sounds, because a picture cannot write a name. Names were the first thing accountants needed that pictures could not give them. Nothing about that change was planned by anybody. By then the system could write anything a person could say. Literature arrived as a side effect of an accounting problem. Nobody set out to invent the alphabet. The pattern repeats in every technology afterwards. A tool built for a narrow job grows general only after somebody has spent centuries failing to make it do the narrow job well.
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Unit 04 · Passage 2
A gap, a name, and three hundred years of refusal
Zero is younger than the wheel by four thousand years. It had to be invented twice. The first zero was a gap. Babylonian scribes left a space to show that a column of their counting was empty, and readers guessed from context. Nobody in Babylon thought of it as a quantity. A gap is not a number. Fifteen centuries later Indian mathematicians gave the gap a name and let it enter the arithmetic itself. Once zero could be added and subtracted, negative numbers followed within a generation. So did the idea of an equation with an unknown in it. Europe resisted the new number for three hundred years after meeting it. Florence banned it in 1299, on the grounds that a symbol meaning nothing could be altered too easily by a dishonest clerk. The ban lasted a lifetime. The objection was practical and it was correct. New tools are refused for good reasons long before they are accepted for better ones.
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Unit 05 · Passage 1
Green glass, a pinch of manganese, and the price of light
Roman glass was green. The colour came from iron in the sand, and nobody knew that until the seventeenth century. Venetian makers found a cure without a theory. Adding manganese turned the green to a faint pink, and the two colours cancelled in the eye. They called it glassmakers' soap because it appeared to wash the colour out. Nobody in Venice could have said why it worked. That trick made clear glass possible and made it expensive. For two centuries a clear pane was a luxury and a window was a small hole. The tax on windows in England was a tax on that price. Buildings were designed around the price of light. The price collapsed when glass began to be rolled rather than blown. Within one generation a wall could be a window, and architects had to learn what to do with a room full of light. The style we call modern began as a change in the price of sand.
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Unit 05 · Passage 2
A brake that turned the cheapest floor into the dearest
Before 1857 the top floor was the cheapest. Nobody wanted to climb six flights of stairs. A century later it was the most expensive. The reason is a brake. Hoists existed for a hundred years before anybody would ride one, because a cut rope meant a fall. Otis did not build a lift. He built a device that grips the rails when the rope goes slack. The engineering was ordinary and the problem was not. The demonstration was the product. He stood on a platform at a fair, had the rope cut with an axe, and did not fall. Orders arrived that afternoon. The fear was the market, not the machine. Nothing about the hoist had improved. Once buildings could be climbed without stairs, height stopped being a punishment and became a view. Rents inverted floor by floor. Architects noticed within a decade and stopped hiding the top storey. A safety catch rearranged the value of every city without changing a single brick.
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Unit 06 · Passage 1
Why north sits at the top of a page that has no top
There is no up in space. So why is north at the top of every map? The honest answer is that Ptolemy put it there. He was working from Alexandria, and the places he knew best lay to the north and west of him. Detail goes at the top of a page because that is where a reader starts. Nothing about the earth required that decision. That accident survived because it was copied. Medieval Europe actually preferred east at the top, towards Jerusalem, and the word orientation still carries that habit. North won when printing arrived and one workshop's plates were copied by everybody else. The convention would be harmless if it stayed a convention. It does not. Studies of readers show that whatever sits at the top of a diagram is judged larger and more important, and world maps are diagrams. A choice made for one man's convenience in Alexandria still shapes what a child thinks a continent is worth.
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Unit 06 · Passage 2
The only unit of time no astronomer would design
A month follows the moon and a year follows the sun. What does a week follow? Nothing in the sky has a period of seven days. The number came from a count of the things that moved against the stars: sun, moon and five planets. The Babylonians counted them and stopped counting. Seven wanderers gave seven days one name each. Those names survived the astronomy that produced them. Saturday still carries Saturn and Monday still carries the moon, in languages spoken by people who never used that calendar. The week is the only unit of time that no astronomer would design. Two governments tried to remove it. Revolutionary France ran a ten-day week for twelve years and the Soviet Union a five-day week for two. Neither government was short of power. Both failed for the same reason: a week is not an astronomical fact but an agreement about when everybody rests at once. Break the agreement and nobody can meet anybody.
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Unit 07 · Passage 1
Two bets about which century will need which plant
A seed bank is a bet about which century needs which plant. There are two ways to make the bet. The first is a vault. Svalbard holds a million samples at minus eighteen degrees in a mountain that would stay frozen even if the power failed for a century. Nothing in it changes. That is the point of a vault. The second way is a field. Farmers in the Andes grow four thousand kinds of potato and swap them every season, so the varieties keep meeting new weather and new disease. Everything in it changes. That is the point of a field. Neither method can replace the other, and the reason is time. A frozen seed is a photograph of one year, taken on the day it went into the cold. A living crop is a film that keeps recording, and a film cannot be paused for a century. The two collections are answers to different questions, and a country that keeps only one has answered only one.
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Unit 07 · Passage 2
A shelf that says nothing new and a playground that will not stop
A language can be saved in two ways and the two do not amount to the same thing. One way is a record. A linguist sits with the last fluent speaker and fills eight hundred hours of tape, a grammar and a dictionary. Everything the speaker knew is now on a shelf. Nothing on that shelf will ever say anything new. That is the point of a record. The other way is a nursery. Children in Wales and in New Zealand learned a language their parents had lost, and the grandchildren argue in it about football. A language that argues about football is producing sentences nobody recorded. The record is easier and the nursery is the point. Nobody argues in a dictionary. Tapes need one funded project; a nursery needs a reason for a nine-year-old to prefer one playground word to another. Every revived language on earth was revived by children who found it useful, not by scholars who found it valuable.
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Unit 08 · Passage 1
The river under the road, and the century it stopped being right
Most cities are built on a river they cannot see. The stream is still there, in a pipe, doing the same work. Burying it was the sanitary answer of the nineteenth century. An open channel in a crowded town carried cholera, and covering it saved more lives in a decade than any hospital did. Nobody was wrong to bury it. The decision was right. It stopped being right when the sewage was separated out a century later. A pipe full of clean rainwater is a river with no daylight and no fish, and it floods when the rain is heavy because a pipe has one width forever. A stream can spread. Seoul took the roof off four miles of one in 2005. Summer temperatures beside it fell by three degrees, flood damage downstream fell by more, and the road it replaced turned out not to be missed. Forty cities have copied it since. An answer can be correct and then quietly stop being correct while nobody is looking.
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Unit 08 · Passage 2
Ten per cent or ninety: the same storm, a different event
Rain that lands on a field walks into the ground. Rain that lands on a city runs. The difference is a number engineers call runoff. A wood sends about ten per cent of a storm downhill; a paved district sends ninety. Nothing about the sky changed. The same storm becomes a different event. The usual reply is a bigger pipe. It works until the storm that beats the design, and every pipe has one, because a pipe is sized for a past century's rain. Bigger pipes also move the flood downstream to somebody with a smaller one. The other reply is to make the city drink. Permeable pavement, planted roofs and a park designed to hold two feet of water for a day cost less than the pipe and fail more gently. A pipe that is overwhelmed delivers a wall of water. A park that is overwhelmed is a wet park. The choice is not between water and no water, but between where it waits.
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Unit 09 · Passage 1
A tax nobody could refuse, and the industry it drew
Salt was the only way to keep food before refrigeration. Nothing else could hold a fish or a ham through six months. A society that could not preserve a harvest could not survive a bad winter. So governments taxed it. A tax on something nobody can refuse is the most reliable tax there is. The French salt tax varied by province. A pound cost eight times more on one side of a line than on the other. A price difference that large is not a tax rate but an invitation. Thirty thousand people were arrested for smuggling salt in a single year, including children carrying it in their clothes. The state then paid for guards, courts and prisons. The enforcement cost more than the difference collected. Every border became a business and every guard became a cost. Nobody had designed a smuggling industry. It was designed by the map of the tax, one province at a time. The tax survived for four centuries.
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Unit 09 · Passage 2
Wheat in a desert, and the rain that was spent
Saudi Arabia was briefly the world's sixth largest wheat exporter. It has almost no rain. The crop grew on water pumped from an aquifer that had filled during the last ice age. The fields were round because the sprinklers turned on a pivot. The government paid farmers five times the world price. The policy was written to make the country safe from a blockade. Nobody was breaking a rule. Every farmer was following the incentive exactly as written. A subsidy large enough to beat physics will be taken up by somebody. The desert filled with circular green fields visible from orbit. The aquifer fell by dozens of metres in twenty years. Two generations of rain had been spent in one. The programme was cancelled in 2008 and the country now imports its wheat. Nothing about the sand had changed. The water does not come back. A payment can be stopped in a morning. What the payment moved cannot always be moved back.
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Unit 10 · Passage 1
A pipe with no walls, and who had the address first
Sound travels four times faster in water than in air. It also travels much further. Nothing about a whale is unusually loud. A whale off Iceland can be heard off Newfoundland. The distance is not a matter of loudness. About a kilometre down, cold water and high pressure form a layer that bends sound back instead of letting it escape. The layer acts like a pipe with no walls. Nothing leaks out of the top or the bottom. A signal that would fade in a hundred kilometres of open sea crosses an ocean inside it. Navies found the layer in the 1940s and kept it secret. Nobody published anything for fifteen years. Biologists reading the declassified papers realised that whale song had been using it for longer than there had been navies. The animals had the map first, and they had it for several million years. We found the pipe and named it; they had been living in it. The discovery was ours; the address was not.
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Unit 10 · Passage 2
The one quiet place, and the request nobody used to make
Radio astronomy needs silence the way a photograph needs darkness. Every phone, every microwave, every car ignition adds a hiss. On earth the hiss is now everywhere. A few valleys are protected by law. Nothing in them is quiet enough for the oldest signals. There is one place in the solar system where the noise cannot reach at all: the far side of the moon, shielded by three thousand kilometres of rock. The shield is complete at the frequencies that matter. A telescope there would hear signals from the first hundred million years after the big bang, which are drowned out anywhere else. Nothing on earth can substitute for it. Two agencies have proposed antennas for that surface. Both proposals include a request nobody used to have to make: keep this quiet. A place with no noise is now a resource, like water or a wavelength. Nobody owns the far side. Resources with no owner are the ones that get spent first.
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Unit 11 · Passage 1
Two customers, one page, and the query nobody sells
A search engine paid by advertisers has two customers. Only one of them is you. Advertisers pay and you do not. This does not make the results dishonest. It makes them optimised for a question you did not ask. The clearest test is what happens to a query with no commercial value. Search for a plumber and the page is dense and useful. Search for a poem you half remember and the page is thin. Nobody sells poems, and nobody bids on the word you half remember. A page about a poem cannot be sold to anybody, so nobody built it well. Subscription search engines exist and the comparison is instructive. They are worse at plumbers and better at poems. Nothing about the underlying index is different. Neither engine is trying to hide anything. Each is simply pointed at the customer that pays it. A reader who knows which customer is paying can read either page correctly. The page was never neutral, and neither is any page.
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Unit 11 · Passage 2
The same average and two completely different products
A five-star average tells you less than the shape of the distribution. Two products can share a score of four point two. The number is the same and the products are not. One has a thousand fours. The other has six hundred fives and four hundred ones. Nothing about the two averages differs. An average hides the question a buyer actually has: what happens when it goes wrong? The first product is mildly good for everybody. The second is excellent for most and a disaster for many. A washing machine with that second shape usually has one part that fails. A restaurant with it usually has one waiter. Sites that show the shape get fewer returns. The information was always in the data. Sellers preferred the average because it was shorter to print. Nobody was misled on purpose. Only the summary threw it away. Every average is a decision about what not to show. A buyer who reads only the number has agreed to that decision without being asked.
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Unit 12 · Passage 1
A closed list and an open room: two jobs called translation
A pocket translator now handles a restaurant order in forty languages. It handles a hospital consent form much less well. Both are called translation and only one is. The gap between those two tasks is where the argument about machine translation lives. Ordering food is a closed problem. A closed problem has a finite list of things a speaker might mean. Consent is open. A patient may be asking about pain, about money, or about whether to tell a daughter. The words are the same in all three cases. No list covers that. Translators who work in hospitals spend most of their time deciding what was actually asked. The deciding is not translation at all, and it is what the room needs. The machine does the other part, which was never the hard part. Nobody markets that half. Every technology looks finished when it is measured on the closed half of its job. The open half is where the professionals stayed.
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Unit 12 · Passage 2
Ninety-nine per cent finished, and the part that was hard
A car that stays in a lane is solved. A car that decides whether a plastic bag is a child is not. Both look like driving. The first problem has an edge. Lane keeping can be tested a million times on the same road. The second problem has no edge, because the world keeps producing objects nobody has classified. A sofa on a motorway, a horse at a junction, a printed picture of a person on the side of a van. Each is rare and there is no end to them. No test set contains the next one. Companies report miles driven without intervention, which measures the first problem. The number rises every year and says almost nothing about the second. A system can be ninety-nine per cent finished and still be missing the part that was hard. The percentage is measured on the half that could be measured. Nothing about the other half has moved. The last one per cent is the whole job.
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Unit 13 · Passage 1
A penny at the door, and what actually crossed Europe
The coffee house arrived in London in 1652 and changed what a conversation was for. The change was not caffeine. Before it, a man who wanted company drank beer in a tavern and grew slower as the evening went on. A coffee house charged a penny at the door and let anybody who paid sit and argue with anybody else. Modern research shows that caffeine reaches the brain within ten minutes of the first sip. Insurance, the stock exchange and two newspapers began in rooms of this kind. A tavern sorted people by rank; a coffee house sorted them by the penny. The drink mattered less than the rule about who could sit down. What spread across Europe was not a bean but a room with a flat price. Nothing about the drink explains any of it. The bean was the excuse, and the excuse was worth a penny. Every one of those institutions began as an argument somebody was allowed to join.
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Unit 13 · Passage 2
One price for every letter, and who started writing
The penny post of 1840 made every letter in Britain cost the same. Distance stopped being the price. Nothing about the paper or the roads changed. Before it, the receiver paid, and the amount depended on how far the letter had come. People refused letters at the door to avoid the charge, after reading the address for a coded message. The first adhesive stamp was printed in black ink and is now the most collected object in the hobby. A flat price removed the negotiation and the volume of post multiplied sevenfold in ten years. Ordinary families began writing to relatives they had not been able to afford to hear from. The Post Office made more money at the lower price, which nobody in the debate had predicted. The reform is remembered as a price change. It was a change in who was allowed to keep in touch. Every reform that removes a haggle removes it for the poorest first. That is where the volume was.
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Unit 14 · Passage 1
Why the hours after studying are part of the studying
Sleep is when a day's learning is filed. The filing is not a metaphor. During deep sleep the hippocampus replays the day's sequences to the cortex at about twenty times the original speed. A rat that ran a maze runs it again in its sleep, neuron for neuron. Adults who sleep fewer than six hours report lower satisfaction with their jobs. Wake the animal during those replays and the maze is gone in the morning. Wake it just as often during other stages and the memory survives. The lesson for a student is narrower than the usual advice, and a good deal more inconvenient. It is not that sleep is healthy. It is that the hours after studying are part of the studying, and cutting them cuts the lesson itself. A night spent revising until three deletes a good part of what was revised. Nothing about effort protects the material, and no amount of wanting it does either. The filing has to happen, and it happens on its own timetable.
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Unit 14 · Passage 2
Twenty minutes, ninety minutes, and the forty everybody hates
A nap of twenty minutes and a nap of ninety do different jobs. The difference is not how tired you are afterwards. Twenty minutes stays in the light stages and clears the pressure that has built since waking. Ninety minutes completes one full cycle and includes the deep stage where the filing happens. Sleep researchers are among the worst sleepers in any hospital. Anything between the two wakes you out of deep sleep and leaves you worse than before. The forty-minute nap is the one everybody complains about and the one most offices allow. Advice that says take a nap is therefore useless. The useful version names a length and explains which job it does. Twenty for alertness before a meeting; ninety for anything you learned that morning. Nothing in between, and nothing at all after four in the afternoon. The body keeps a clock and a nap borrows from it rather than adding to it. What you borrow at five you repay at midnight.
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Unit 15 · Passage 1
Why the pavement is the last step and not the first
A city that wants people to walk usually starts by widening the pavement. That is the last step, not the first. People walk when there is somewhere to walk to within about a quarter of an hour. A shop, a school and a doctor within that radius do more for walking than any pavement. Nothing about the surface matters if the destination is four miles away. Those destinations were removed by a rule, not by a preference. Zoning codes written after 1950 separated shops from houses on the grounds that shops were noisy. The separation made a car necessary and then made the road wider and then made the walk unpleasant. Each step was reasonable and the sum was not. Cities that reversed this changed the code before they changed the kerb. A bakery allowed on a residential corner does more than a mile of new paving. The pavement still has to be built. It just cannot be built first, because a beautiful path to nowhere stays empty.
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Unit 15 · Passage 2
A street where the driver is not sure whose space it is
A quiet street is not a street with no cars. It is a street where a car is a guest. Dutch engineers tested this in the 1970s by removing the kerb entirely. With no line between path and road, a driver loses the signal that says the space is his. Speeds fell without a single sign, a camera or a raised hump. The result unsettles two groups at once, and for opposite reasons. Engineers dislike it because it removes the rule they were trained to install. Campaigners dislike it because it looks like a street with no protection at all. Both objections assume that safety comes from separation. In this design it comes from uncertainty, which is an uncomfortable thing to write into a standard. A driver who is not sure whose space it is drives at the speed of somebody who is not sure. The method fails where traffic is heavy, and nobody claims otherwise. Where it works, it works by taking away the very thing everybody wanted to add.
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Unit 16 · Passage 1
Four devices and one job: the joint between two sentences
Every unit of this book has been about one machine: the joint between two sentences. A joint is invisible when it works, and it works nearly all the time. It becomes visible the moment somebody shuffles the parts. Pronouns hold two sentences together by pointing backwards at something already named. Articles hold them together by marking what has already been introduced. Connectives hold them together by naming the relation: cause, contrast, example. Time words hold them together by fixing an order that cannot run backwards. Four devices, one job. A test can only ask about a joint by breaking one. Order questions break the sequence; insertion questions remove a part; irrelevance questions add one that does not fit. Nothing else is going on in these three types, whatever the passage happens to be about. A reader who repairs joints does not need to know the topic at all. That is why a physicist can solve a passage about medieval trade in ninety seconds.
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Unit 16 · Passage 2
The habit that outlasts the examination
The habit outlasts the examination. A meeting, a contract and a news report are all held together by the same four devices. A contract that says the party rather than a party has already told you something. Somebody has been defined earlier and you are meant to have read that far. Lawyers read for that word before they read for the money. A news report does the same work with time words. Later, afterwards and following the meeting carry claims about sequence that nobody has to prove. Two events placed in that order are read as cause and effect whether or not anybody said so. This is the last thing the book has to say. Reading is not a matter of knowing more words. It is a matter of noticing the joints that somebody else built and asking whether they hold. Every unit here has been one joint, taken apart on a table. M3-2 puts the tools back and asks you to work at speed.
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