Bài đọc tiếng Anh — Khác
300 bài đọc gốc do nhóm FitForm tự viết, chia theo trình độ B1 → C2 và theo chủ đề. Đọc thoải mái không cần tài khoản; muốn làm bài tập, ôn từ vựng và được chấm bài viết thì đăng nhập FitForm.
What FitForm League is
FitForm League is a web platform that turns short bursts of exercise into a game for secondary school…
How a camera counts a repetition
Counting looks simple to a human and is surprisingly hard for a computer. FitForm uses a pose model from an…
Designing against cheating
Soon after the first version reached real users, a problem emerged that no one on the team had anticipated.…
Why streaks work
A streak is simply the number of days in a row on which you complete a task. It sounds trivial, yet in many…
The economics of a school platform
Why can a student team give away software that a company would sell? The answer lies in the cost structure of…
Privacy by design
Any product that points a camera at children invites a hard question: where does the video go? FitForm…
Exercise and the teenage brain
The World Health Organization advises that young people between five and seventeen should be physically…
Writing a README that people read
A README is the front door of a project. Judges, teachers and strangers on the internet decide in about a…
The ten-minute rule
When a task feels too big, most people do not start it at all. Psychologists have a simple trick for this,…
Why warming up works
Coaches have told athletes to warm up for a century, but the reasons are more interesting than the habit. A…
What a queue teaches
A queue is a small economy. It has a scarce resource, a rule for sharing it, and people who respond to…
The photo that proves nothing
A photograph used to be a kind of evidence. If you had a picture of an event, the event happened. That…
The cost of a plastic bottle
A plastic water bottle costs about five thousand dong. That price covers the plastic, the water, the…
Learning from a mistake
Most students hate making mistakes in front of other people. That feeling is natural, but it works against…
How a school chooses software
Students often assume that schools buy software the way they choose an app: someone sees it, likes it and…
The language of sport
English is full of expressions borrowed from sport, and people use them without noticing. Learning them is…
Measuring a school day
A class of grade eight students decided to measure how much they actually moved during a normal school day.…
A job that did not exist
Ask an adult what they wanted to be at fourteen and the answer is usually a job that still exists: doctor,…
The clock that changed work
Before mechanical clocks, a working day was measured by daylight and by tasks. A field was ploughed; a loaf…
Where your food comes from
A plate of rice, vegetables and fish looks local, and much of it is. But the inputs behind it travel further…
The myth of learning styles
Ask a hundred teachers whether students learn better when taught in their preferred style — visual, auditory,…
Reading a painting
Standing in front of a painting for the first time can feel like being asked a question you did not prepare…
The price of attention
A service that costs nothing still has a price, and in the case of most apps the price is attention.…
Antibiotics and patience
Antibiotics changed medicine more than almost any other invention of the twentieth century. An infection that…
What makes a city walkable
Planners have a word for how easy it is to get around on foot: walkability. It sounds vague, but it can be…
The grammar of politeness
English learners often master tenses and still sound rude, because politeness in English is carried less by…
Sleep and the exam
The night before an important exam, thousands of students make the same decision: study later, sleep less.…
Open source and the commons
Much of the software running the modern world is written by people who are not paid for it and given away to…
The library that lends things
A library lends books. In about a hundred cities, libraries now lend other things too: drills, sewing…
Why maps lie
Every flat map of the world is wrong. This is not carelessness; it is geometry. A sphere cannot be flattened…
The first week of a habit
Almost everyone can do something new for three days. The interesting question is what happens in the…
The invisible work of translation
A good translation is noticed only when it fails. The reader meets a sentence that limps, looks up, and…
Noise in the classroom
Teachers ask for quiet so often that the request sounds like discipline rather than physics. In fact the…
What a budget reveals
People say what they value; a budget shows it. Reading one is a skill worth having before you are old enough…
The student who tested the counter
Three weeks after the first version appeared, a student in grade nine sent a message to the team: your…
Memory and the shape of a day
Ask someone to describe last Tuesday and you will hear three or four moments, not fourteen hours. Memory does…
The rules of a fair game
Any competition between unequal participants faces the same question: should the prize go to the strongest,…
An hour of electricity
Switch on a classroom light and something starts burning, spinning or shining somewhere else. Following that…
The twenty-minute rule
Most advice about exercise assumes you have an hour, a gym and a change of clothes. Most students have none…
The bus that decides
When a school asks why some students stop coming, the answers people expect are about motivation or family…
What a test can and cannot measure
A test is a measuring instrument, and like any instrument it has a range. A kitchen scale is excellent for…
Why a correction travels slowly
In 2018 a group of researchers tracked how stories spread across a large social network. Their central…
Salt in the rice field
A delta is a negotiation between a river and the sea, and for most of recorded history the Mekong won. Fresh…
The average that hides everyone
In the 1950s the United States Air Force had a problem it could not explain. Pilots were losing control of…
The warm-up is not wasted
Almost every student who has been told to warm up has quietly wondered whether it is really necessary. Five…
The rule that nobody reads
Every app a student installs asks for agreement to a document that almost nobody opens. Researchers who have…
The water bottle experiment
A class in Da Nang tried a small experiment for three weeks. Every student brought a one-litre bottle to…
Ten minutes before bed
Ask a group of fifteen-year-olds how they fall asleep and most will describe the same scene: lying in bed…
The classroom that was too loud
Room 204 had a reputation. Teachers said the students there did not listen. Three different teachers said it,…
Why nobody asks a question
At the end of an explanation a teacher asks whether anyone has a question. Thirty students look at their…
The bicycle and the city
In 1970 Amsterdam was a city of cars. Photographs from that year show the main squares used as car parks and…
The shop with no prices
A student-run shop in a secondary school sold snacks at break. In its first term it lost money, which puzzled…
The referee and the replay
Video review arrived in football with a straightforward promise: fewer wrong decisions. By that measure it…
Learning a sport at fifteen
There is a quiet belief among teenagers that if you have not started a sport by about ten, it is too late.…
What a map leaves out
Every map is a lie, and a useful one. The surface of a sphere cannot be laid flat without stretching…
The river that moved
Rivers look permanent on a map. On the ground they are among the least permanent things in a landscape. A…
The first job interview
Most advice about interviews is about what to say. The more useful advice is about what to prepare before you…
The work that did not exist
A reasonable way to think about future work is to look backwards. The jobs held by people now in their…
The photograph that was not taken
In 2023 a picture of a flooded street in a European city spread across social networks during a storm. It had…
The comment you never see
Every large platform decides, thousands of times a second, what you will not see. This is usually described…
Who owns a photograph of you
A classmate takes a photograph of you at a school event and posts it. Who decides what happens to that…
The rule with no reason
Every institution accumulates rules whose origins nobody remembers. A school forbids a particular coat. A…
Reading a percentage
A headline reports that a treatment cuts the risk of a disease by fifty per cent. That sounds decisive.…
The sample of one
My grandfather smoked and lived to ninety-four. This sentence has ended more arguments about health than any…
The island that counted birds
On a small island off the coast of Scotland, volunteers have counted seabirds every June since 1969. They…
Why ice floats
Almost every substance becomes denser as it cools. Water does too, until it reaches about four degrees above…
The cost of switching
Open a maths exercise. Work for four minutes. Check a message. Return to the maths. How long does it take to…
The promise of the blank page
Ask a student why an essay has not been started and the answer is rarely laziness. It is more often that…
The engineer who asked why twice
A pump in a factory kept failing. The maintenance team replaced it four times in two years, each replacement…
The bridge that swayed
When the Millennium Bridge in London opened in June 2000, around ninety thousand people crossed it on the…
The canteen queue
Every school canteen has the same problem. Everybody arrives at once, the queue reaches the door, and by the…
The library of Alexandria did not burn
The story is familiar. A great library, the collected knowledge of the ancient world, destroyed in a single…
The clock and the factory
Before the eighteenth century most people did not know what time it was, and did not need to. Work followed…
The song that everyone knows
Every culture has songs that nobody remembers learning. You did not sit down to study them. They arrived…
Why museums argue about labels
The small card beside an object in a museum looks like the least controversial thing in the building. It is…
The colour that had no name
In ancient Greek texts the sea is described as wine-dark and honey is described as green. Readers have found…
The village that shared a wall
Economists once taught a confident story about shared resources. If a pasture belongs to nobody, each herder…
The cost of a free bus
Several cities have made public transport free. The results are more interesting than either side of the…
The exam that measured the wrong thing
A national reading test was introduced with a sensible aim: to find out whether eleven-year-olds could read…
What a forest remembers
Two patches of woodland can look identical and be entirely different things. One grew back on abandoned…
The price of a quiet room
Noise is the pollutant people complain about most and regulate least. Unlike smoke it leaves no residue, and…
The interview with the machine
A growing number of employers use software to sift applications before any person reads them. The attraction…
The backup that did not exist
A small company lost eleven years of records in an afternoon. They had backups. The backups had been running…
The last speaker
A language is declared extinct when its last fluent speaker dies. Linguists estimate that this happens…
The pencil nobody can make
Pick up a pencil. It costs almost nothing. Now try to find one person on earth who knows how to make it. The…
The queue at the wrong door
Some doors are pushed when they should be pulled. This happens so often that designers have a name for it: a…
The team that talked last
A research group at Google spent two years trying to find what made some teams work better than others. They…
The money in the jar
A simple experiment has been repeated in many countries. People are given a sum of money and asked to divide…
The thermometer in the sun
Weather stations keep their thermometers inside a white box on legs, with slatted sides, standing at a fixed…
The plant that counts
The Venus flytrap closes on an insect. That much is familiar. What is less known is that it will not close…
The first rule of first aid
Every first aid course begins with the same instruction, and students are always slightly disappointed by it.…
The sound of your own voice
Almost everyone dislikes hearing a recording of their own voice. The usual explanation — that we are simply…
The map of the school day
A class in Hue was asked to draw a map of their own day: not a timetable, but a line showing how awake they…
The number that decided a career
Ask adults how they chose their work and a surprising number describe something small: a teacher who said one…
The last two per cent
Anyone who has built something will recognise the shape of the problem. The system works. It handles the…
The silence after the question
In 1951 Solomon Asch asked groups of students to judge which of three lines matched a reference line. The…
The goalkeeper who stood still
A study of several hundred penalty kicks in professional football found something that ought to change how…
The rice that came from nowhere
Between 1960 and 2000 world cereal production roughly tripled while the area farmed grew by about ten per…
The museum of ordinary things
Museums are full of gold and weapons because gold and weapons survive. Wooden tools rot, cloth decays, food…
The machine that could not say no
Ask a language model a factual question it has no basis for answering, and the older ones would answer…
The fish that walked inland
When a new road or dam crosses a river, the fish on either side stop being one population and become two.…
Reading a graph backwards
A graph is an argument with a picture around it, and the picture is doing more work than most readers notice.…
The habit of the second draft
Most students write one draft. They write it, read it once for spelling, and hand it in. The single most…
The shadow on the well
Around 240 BCE a librarian in Alexandria measured the size of the Earth using a stick, a well and some…
The smallest useful change
When a team decides a product needs improving, the instinct is to plan a large release. Several months later…
The cost of being early
Business history is usually told as a story of first movers, and the story is mostly false. The first company…
The word for blue sky
Learners often assume that vocabulary means a list of words with their translations. It is a reasonable…
The argument you should lose
There is a question worth asking before any disagreement: what would change my mind? If the answer is…
The water under the field
Beneath a great deal of farmland lies an aquifer: a layer of rock holding water that fell as rain, in some…
The deterrent that did not deter
A school introduced a fine of ten thousand dong for arriving late to the after-school club. The aim was…
The prognosis and the diagnosis
Two words are often used as though they meant the same thing. A diagnosis says what the illness is. A…
The backlog nobody owned
A school office had a backlog of three hundred unanswered emails. Everybody knew about it. Nobody was…
The word that changed the vote
In a well-known experiment, two groups of people read a description of a city facing a disease outbreak…
The arable land that moved uphill
Maps of where crops grow are usually treated as fixed features of a country. Over a human lifetime they move,…
The contingency nobody wrote down
Every plan contains an assumption about what will not go wrong. Most of the time the assumption holds, which…
The tenuous link
Headlines connecting a food to a disease appear several times a month. Most rest on a link that is real,…
In praise of working slowly
Speed is treated as a proxy for ability in almost every classroom. The student who finishes first is assumed…
The silt behind the dam
A dam is designed around water. The thing that eventually defeats many dams is silt. Every river carries…
The candid report
Most organisational reports are written to be survivable rather than true. This is not because the authors…
The ambivalent majority
Public arguments are conducted by people with firm views. Most people do not have firm views, and this shapes…
The queue for the microscope
A science teacher in Hai Phong had one working microscope and thirty-two students. The usual arrangement was…
The wind that built a city
Why are so many old cities on the eastern side of their rivers, or the northern side of their hills? The…
The two-minute rule
A small piece of advice circulates among people who manage a lot of small tasks: if something takes under two…
The price of the last seat
Two passengers on the same flight, in identical seats, frequently paid very different amounts. This is not a…
The letter that was never sent
Archives contain a particular category of document that historians value more than almost any other: the…
The building that breathes
An office in Harare was built without air conditioning in a climate where air conditioning is normal. It uses…
The name on the door
A hospital in Scotland tried an experiment that cost nothing. Staff began writing their first name and role…
The film that shows its working
Most films hide how they were made. The cut is invisible, the camera is unnoticed, and the audience is…
The medicine that tasted wrong
A programme distributing a nutritional supplement in several districts reported a strange pattern. Uptake was…
The word order problem
Vietnamese learners of English make a particular mistake with adjectives, and it is interesting because…
The second opinion
In several professions, an expensive decision requires a second person to look independently before it is…
The measure of a forest
Countries report how much forest they have, and the numbers are compared, published and used to judge policy.…
The practice that felt worse
Two groups of students practised the same material for the same length of time. One group studied each topic…
The tax on windows
In 1696 England introduced a tax on windows. The reasoning was sensible: counting windows from the street…
The shortcut across the grass
Walk through almost any park and you will find a worn line across the grass, cutting the corner that the…
The thousand-year flood
A town is told its new defences will protect against a thousand-year flood. Two years later the town floods.…
The mountain that makes rain
Travel across a mountain range and the landscape frequently changes completely between one side and the…
The app that asked too much
A free torch app once requested access to a user's contacts, location and microphone. A torch needs one…
The runner who slowed down
Ask a group of students to run a distance as fast as they can and watch the first hundred metres. Most set…
The colour of the package
Two identical products sit on a shelf. One sells twice as well. Frequently the difference is nothing to do…
The committee of one
A common piece of workplace folklore says that decisions should be made by groups because groups are wiser…
The river of rubbish
Studies of plastic reaching the sea keep finding the same uncomfortable shape. A small number of rivers carry…
The silence of the archive
A historian studying an eighteenth-century town can tell you what the magistrates decided, what the merchants…
The test before the lesson
A teacher gives a short test on material the class has not been taught. Students get most of it wrong, which…
The cost of a small font
A government form was redesigned and the number of errors fell by about a third. No wording changed. The…
The promise of the average day
People planning a task reliably underestimate how long it will take, and the underestimate survives…
The bread that waits
Bread made in twenty minutes and bread made over twelve hours use the same four ingredients. The difference…
The map with no names
A map of a country with the place names removed is still a political document. The lines are the argument.…
The invisible repair
A bridge that has never failed receives no praise. A bridge that fails and is rebuilt produces headlines, a…
The interview with no questions
A manager hiring for a practical job stopped asking questions. Instead, candidates spent ninety minutes doing…
The problem with averages in class
A class average of six out of ten can describe two completely different classes. In the first, almost every…
The language of the kitchen
English food words carry a history that most speakers never notice. Cow, pig, sheep and deer are the animals.…
The weight of the backpack
A survey of secondary school students found that the average bag weighed about twelve per cent of the…
The coin that remembers
A fair coin has landed heads six times in a row. What is the chance the next throw is heads? Most people feel…
The smell of the classroom
Carbon dioxide is the gas we exhale, and in a closed room full of people it accumulates. Outdoor air contains…
The rule of the first draft
A student sits down to write an essay and spends forty minutes on the first paragraph. The paragraph is good.…
The island with two clocks
For most of human history, time was local. Noon was when the sun was highest where you stood, which meant…
Thinking in the other language
A curious finding has been replicated several times. People make more consistent decisions about risk when…
The warehouse that walks
In an older warehouse, a worker walks to the shelf. In a newer one, the shelf walks to the worker. Small…
The lamp that outlived the plan
A fire station in California has a light bulb that has been burning, almost continuously, since 1901. It is…
The field that was left alone
In 1882 an agricultural research station in England stopped cultivating a wheat field and simply fenced it.…
The queue that split itself
Supermarkets have separate queues for each till. Airports and banks mostly use one long queue feeding several…
The athlete who rested
Training does not make you stronger. Recovering from training makes you stronger, and training is what…
The town that counted cats
A small town wanted to know how many stray cats lived in it. Counting them directly was impossible: cats…
The house that faces south
In the northern hemisphere, a window facing south receives sun for most of the day. A window facing north…
The promise that was kept
A village in Kerala agreed in the 1990s that every household would send its daughters to secondary school.…
The paper that nobody read
An idea published in 1945 described a machine that stored documents and let a reader follow links between…
The cheapest thing in the room
A school was deciding between two projectors. One cost four million dong, the other seven. The cheaper one…
The memory of a smell
A smell can return a memory with a completeness that a photograph rarely manages. The reason is anatomical…
The stamp that changed the post
Before 1840, British letters were paid for by the person who received them, and the price depended on…
The clinic at the market
A district health service wanted more adults screened for high blood pressure. The clinic was free, well…
The photograph of the eclipse
In 1919 two expeditions photographed stars near the sun during a total eclipse. The point was to measure…
The last exam
The Chinese imperial examination, in some form, ran for about thirteen centuries. At its height it was the…
The benefit of the doubt
A driver cuts in front of you. The immediate explanation is that they are selfish. If you later cut in front…
The shape of a good question
Teachers are told to ask good questions and rarely told what makes one good. There are at least three…
The cost of free delivery
An online seller offers free delivery above a threshold. A shopper with eighty thousand dong in the basket…
The thing that did not change
Lists of the skills employers want have been published for forty years. The technologies on them change…
The last mile of the road
A road connecting two cities is usually built to the same standard along its whole length. The final…
The glass that rings
Rub a wet finger around the rim of a wine glass and it sings. Add water and the note drops. This is a…
The form with one question
A charity's online donation page asked for name, address, telephone number, date of birth and how the donor…
The translation that chose
A translator meets a sentence with two possible readings and must pick one. The original keeps both. The…
The inspection that found nothing
A food safety inspector visits a kitchen and finds nothing wrong. Two weeks later the same kitchen causes an…
The notebook and the keyboard
Students taking notes on a laptop write more words than students taking notes by hand. On tests of factual…
The rule that wrote itself
A school banned phones in corridors. The rule was one sentence long and everyone understood it. Three years…
The witness who was sure
Confidence and accuracy are different things, and courts have spent two centuries learning how different. A…
The headline that was true
'Cycling deaths rise by fifty per cent' is a true statement about a town where the number went from two to…
The correction on page nine
A newspaper printed a wrong figure on its front page. The correction appeared eleven days later in a box at…
The photograph with no caption
The same photograph appeared in two newspapers on the same morning. In one it illustrated a story about a…
The painting that was cleaned
When a gallery cleaned a seventeenth-century portrait, the sky turned from brown to blue and the public…
The sculpture that faced the wrong way
A bronze figure stood in a square for ninety years facing the town hall. When the square was redesigned, the…
The song that was two songs
A melody written for a funeral in 1860 became a stadium chant in the 1970s. The notes are the same. Almost…
The museum with one object
A small museum tried an experiment. For one month it displayed a single object in an otherwise empty room: a…
The dictionary that followed
Dictionaries are often treated as courts of appeal, which is a misunderstanding of what the modern ones do. A…
The word that moved house
'Nice' once meant foolish. Before that, in Latin, it meant not knowing. Its journey to the compliment it is…
The accent in the interview
Two recordings of the same answer, read by the same actor in two accents, were played to a hundred people…
The queue and the fair share
A clinic replaced its single queue with an appointment system and the waiting room emptied. Complaints rose.…
The census that missed a street
A national census undercounted one city district by an estimated eleven per cent. The questionnaires were…
The bus stop that moved fifty metres
Moving a bus stop fifty metres down the road cut use of that stop by a fifth. The buses were the same, the…
The border that followed a river
Two provinces agreed in 1908 that their boundary was the main channel of the river. The agreement was…
The city that cooled itself
On an August afternoon the difference between two streets a kilometre apart was eight degrees. One had trees;…
The forest that was planted wrong
Two million trees were planted on a hillside. Eight years later about a tenth were alive, and the soil was in…
The reservoir and the dry year
A reservoir designed for a one-in-fifty-year drought failed in its thirty-first year. The engineering was…
The herd that was not counted
Counting animals in a forest is harder than it sounds, and the honest methods all begin by admitting that…
The experiment that worked too well
A classroom study of a new teaching method reported an improvement so large that the authors spent most of…
The instrument that drifted
A school's weather station reported that the playground had warmed by 1.4 degrees in six years. The…
The dose that was halved
A clinic halved the dose of a drug for one group of patients and the results were indistinguishable from the…
The waiting list that grew shorter
A hospital department cut its average wait from fourteen weeks to six without seeing a single extra patient…
The first aid that did nothing
Half of what used to be taught as first aid has been removed from the courses, and the removals are more…
The calendar that lost eleven days
When Britain changed calendars in 1752, the second of September was followed by the fourteenth. Eleven days…
The tax records that became history
Almost everything known about ordinary life in many pre-modern societies comes from documents written to…
The monument with a new plaque
A city council spent two years deciding what to do about a statue, and the eventual answer was a second…
The number that was an average of averages
A district reported an average class score of 71 by averaging the averages of its eleven schools. The correct…
The dice that felt wrong
Ask thirty students to write down a made-up sequence of forty coin tosses, and ask thirty more to toss a coin…
The graph with a cut axis
A chart showed support for a proposal rising from 48 to 52 per cent. The bars appeared to triple in height,…
The model that memorised
A system trained to spot a disease in chest images reached 97 per cent accuracy in testing and failed in the…
The search that knew too much
Two people searched for the same four words on the same morning and received different first results. Neither…
The update that broke the printer
A school's printers stopped working after an automatic security update. The update was correct, necessary and…
The password that was too strong
An office required passwords of twelve characters with upper case, lower case, digits and symbols, changed…
The feeling of knowing
The sensation that you know something is a separate mental event from knowing it, and the two can be pulled…
The reward that removed the interest
Children who enjoyed drawing were given a certificate each time they drew. When the certificates stopped,…
The silence that was not agreement
A meeting of eleven people approved a plan unanimously. Interviewed separately afterwards, seven of them said…
The habit that survived a holiday
Two groups of adults took up running. Both ran for eight weeks and then went away for two. On returning, one…
The second language that came back
A woman who had not spoken her first language since childhood began lessons again at sixty. Within three…
The festival that was invented
A village festival described as centuries old was designed in 1954 by a committee of four people, and the…
The recipe that changed countries
A dish sold in three cities under three names has one ancestor and three different claims of ownership, all…
The subtitle that chose a word
A character in a film says four syllables. The subtitle reads 'I understand'. A different subtitler, working…
The loan word that came home
English borrowed a word from Japanese, changed its meaning, and lent it back. Japanese now has two forms of…
The exam that tested reading speed
An examination intended to measure comprehension was found, after analysis, to be measuring reading speed.…
The homework that was marked twice
A department had every piece of work marked by two teachers for one term. The second marks were not reported…
The class that set its own test
A teacher asked each student to write three exam questions on a topic and to supply the answers. The exercise…
The tutor who said less
Recordings of tutorials found that the most effective tutors spoke for about a third of the session. The…
The timetable that was redesigned
A school moved its hardest subjects to the morning and its results improved in two of them and fell in a…
The substitute who changed the game
A coach made the same substitution in eleven matches and the team scored shortly afterwards in seven of them.…
The record that was a shoe
Between 2017 and 2020, marathon times at the top of the sport improved faster than in any previous three-year…
The team that practised losing
A basketball coach spent twenty minutes a week rehearsing situations in which the team was behind with two…
The injury that was predictable
A club cut its soft-tissue injuries by almost half without changing its medical staff, its physiotherapy or…
The referee who explained
A league trialled a rule requiring referees to announce the reason for every video review over the public…
The job description that was rewritten
An organisation rewrote one job advertisement and the number of applications from women tripled. The job did…
The promotion that removed the skill
An organisation promoted its three best engineers to management. Within a year, two had asked to go back and…
The reference that said nothing
A reference letter that says a candidate was punctual, pleasant and reliable is usually a refusal to…
The meeting that became an email
A team replaced its weekly status meeting with a written update and gained four hours a week. Six months…
The price that ended in nine
Changing a price from 50 to 49 raises sales by more than changing it from 51 to 50, although the second…
The subsidy that raised the price
A government offered buyers a grant of twenty per cent towards a product. Within eight months the list price…
The shop that moved the milk
Supermarkets put milk at the back. The reason is often given as a trick to make shoppers walk past everything…
The insurance that made people careless
A scheme that reimbursed the full cost of replacing stolen bicycles saw theft claims rise by a third in its…
The currency in the classroom
A teacher ran a term-long experiment in which students earned tokens for completed work and could spend them…
The bridge that was overbuilt
A footbridge designed for a crowd load it has never carried has stood for sixty years with almost no…
The switch that had to be ugly
The emergency stop on an industrial machine is a large red mushroom that must be struck rather than pressed,…
The tolerance that cost a week
Every part of an assembly passed inspection. The assembly did not fit, and nobody had made a mistake. A…
The pump that ran at night
A water utility cut its electricity bill by a fifth without reducing the amount of water it moved. It changed…
The form that lost half its users
A registration form had seven fields and lost about half the people who started it. Six months and several…
The feature that nobody asked to remove
A team removed a feature used by four per cent of its users. The four per cent complained loudly, the other…
The default that decided
Changing a setting's default from off to on moved about seventy per cent of users, and the setting was one…
The error message that helped
A payment page's error message was changed from 'Transaction failed' to 'Your bank declined this card. Try…
The survey that asked the wrong people
A product team surveyed its users about a proposed change and received an overwhelmingly positive response.…
The queue that was a signal
A restaurant with a nightly queue reduced its seating by a quarter. Revenue rose. The decision looks…
The warehouse that knew the weather
A supermarket chain found that a two-degree rise in forecast temperature changed sales of certain products by…
The precedent that was narrow
A court decided a case about a photograph taken in a park, and within a year the judgment was being cited in…
The contract with one ambiguous word
Two companies spent eleven months in dispute over whether 'days' meant working days or calendar days. The…
The evidence that was inadmissible
A confession obtained without a lawyer present was excluded, and the accused was acquitted. The confession…
The anonymous source
A newspaper published an account based on an unnamed official and was proved right eighteen months later.…
The poll that moved the vote
Publishing a poll changes the thing the poll measures, and the direction of the change is not consistent. Two…
The interview that was edited
A forty-minute interview became four minutes of broadcast, and the subject complained that she had been…
The translation that added a footnote
A novel's first sentence contains a pronoun that marks the speaker as younger than the person addressed, and…
The phrase that only exists in exams
'Last but not least' appears in examination answers far more often than in anything else written in English,…
The idiom that translated itself
Some idioms cross languages easily and some do not, and the difference is largely predictable. An idiom built…
The register that gave it away
A complaint letter containing the sentence 'I was pretty annoyed, to be honest' failed to achieve anything,…
The footnote that held the argument
A student's essay was returned with a single comment: the argument is in footnote four, and it should be in…
The prerequisite that was not one
A course listed a prerequisite that had been added in 1998 and had not been reviewed since. Removing it had…
The group project that was fixed
Group work is defended as preparation for working life and complained about for a specific reason: the mark…
The mark that was a ranking
A score of 68 in one examination system means a fixed standard of work. In another it means being in the top…
The practice test that came first
A class sat a test on material they had not been taught. They scored almost nothing, and then learned the…
The skeleton in the wrong grave
A skeleton excavated in 1904 was identified from a grave marker, catalogued, and used for a century as a…
The population that was estimated twice
Two respected estimates of a city's population in 1650 differ by a factor of three. Both are defensible, and…
The map that was a claim
A sixteenth-century map shows a river running west where no river runs. The cartographer had never been…
The cohort that was followed
A study that followed twelve thousand people for thirty years produced a finding that no trial could have…
The screening that found too much
A screening programme detected three times as many cases of a cancer as had been diagnosed before it began.…
The guideline that was updated
A clinical guideline changed its advice, and the newspapers reported that doctors had been wrong for twenty…
The colour that was not measured
Two prints of the same photograph, made from the same file by two laboratories, differ visibly. Both are…
The building that aged well
Two buildings on the same street were completed in the same year. One looks cared for and one looks…
The rehearsal that changed the text
A play printed in 1623 contains a line that makes no sense, and three centuries of editors have proposed…
The dashboard nobody read
A team built a dashboard with forty-two charts. Six months later, logs showed that eleven people had opened…
The backup that was never restored
An organisation ran nightly backups for four years without a failure and discovered, on the day it needed…
The invention of the exam
Written examinations feel as natural to students as the walls of a classroom, but they are an invention with…
Attention is a limited resource
Students are often told to concentrate, as though attention were a decision rather than a resource. Research…
The cost of cheap energy
Every device in a school hall runs on electricity that came from somewhere, and where it came from has…
Why cities forgot to play
Photographs of Hanoi, London or São Paulo from the 1950s share an odd feature for modern eyes: children on…
What makes a language learner
Ask a hundred people why they never learned a second language and most will say they have no talent for it.…
Your first session
You do not need special clothes, a gym or a coach to start. You need a tablet or a laptop with a camera, a…
Sixty active minutes
Health organisations advise young people to be physically active for about sixty minutes a day. Most students…
A camera is not a recorder
When students hear that an app uses the camera, the first question is always the same: where do the pictures…
The class that came back
In the first week, class 7S trained every day. In the second week, half the class stopped. This is normal,…
Learning English like training
Many students study English the way some people exercise: nothing for three weeks, then five hours before a…
Who built this
FitForm League was built by three students in grade eight at Trưng Vương Secondary School in Hanoi, with help…
How a pose model sees you
Every second that the camera is on, the browser receives about thirty pictures. To a computer, each picture…
The economics of free
Nothing is free; some things are only free to the person using them. FitForm League costs a student nothing,…
Engineering for the worst classroom
Most software is designed in the condition where it works best: a new laptop, fast internet, a quiet room,…
Habit over motivation
Ask a class of thirteen-year-olds whether exercise is good for them and every hand goes up. Ask how many…
Measuring what matters
A number on a screen feels like a fact. It is not: it is the end of a long chain of decisions about what to…
From one school to a district
A pilot that works in one school proves less than it appears to. The first school has the founders walking…