A timeline of trouble
Roughly 600 BCE to 2013. Read it top to bottom and you can watch the same handful of problems — infinity, self-reference, aggregation, measurement — reappear in each new field that gets rigorous enough to notice them.
Ancient
Before 500 CE · 7 entries
- c. 600 BCE (the Epimenides line); c. 350 BCE (Eubulides' paradox)The Liar Paradox"This sentence is false." If it is true then it is false, and if it is false then it is true. Two and a half thousand years later there is still no agreed answer — only competing bills to pay, in logic, in language, or in common sense.
- c. 450 BCEAchilles and the TortoiseAchilles gives a tortoise a head start. By the time he reaches where it was, it has crawled a little further — and so on, forever. Zeno concluded he can never overtake it. He does, and the infinitely many stages take a perfectly ordinary eleven seconds.
- c. 450 BCEZeno's Dichotomy ParadoxTo cross a room you must first cross half of it, then half of what is left, then half of that — an endless list of jobs. Zeno concluded that motion is impossible. The steps do add up to a finite total, but whether that fact actually answers him is still argued over.
- c. 420 BCE (traditional); earliest surviving account 2nd century CEThe Paradox of the CourtA law student agrees to pay his teacher only after winning his first case — then never takes one. The teacher sues, and in court each man produces a watertight argument that he must win. Both arguments cannot be right, and it turns out neither is.
- c. 380 BCEMeno's ParadoxIf you already know what you are looking for, you do not need to search for it. If you do not know what you are looking for, you will not recognise it when you find it. So inquiry is either unnecessary or impossible. Yet we learn, and we search, and we recognise discoveries when we make them.
- c. 350 BCEThe Sorites ParadoxTake one grain from a heap of sand and it is still a heap. Repeat. Every single step looks harmless, yet you end holding one grain and no heap — and no step was ever the one that destroyed it.
- c. 75 CE (Plutarch's report of an older dispute)The Ship of TheseusReplace a ship's planks one at a time until none of the originals remain. Is it the same ship? Now build a second ship from the planks you took out — and answer again, knowing both ships are floating in front of you.
Medieval
500 – 1500 · 2 entries
- c. 1320Occam's RazorAmong competing explanations that fit the evidence equally, prefer the one with the fewest unnecessary assumptions. The razor does not guarantee truth — the simplest explanation is often wrong — but it is the correct starting prior when evidence does not yet distinguish between competing theories.
- c. 1340 (the attribution; the example is far older)Buridan's AssA donkey stands exactly midway between two identical bales of hay. Having no reason to prefer either, it starves. The story is named after a man who never told it, and it is really a question about what a reason is for.
Early Modern
1500 – 1800 · 4 entries
- 1638Galileo's ParadoxMost whole numbers are not perfect squares, so the squares must be rarer. Yet every number has exactly one square and every square has exactly one root, so there are precisely as many of one as of the other. Both claims are true.
- 1641Gabriel's HornRotate the curve y = 1/x around the x-axis from x = 1 to infinity. The solid of revolution has a finite volume — you can fill it with paint — but an infinite surface area — you cannot paint its inside. The same amount of paint does both and neither.
- 1713 (posed by Nicolaus Bernoulli), 1738 (published by Daniel Bernoulli)The St. Petersburg ParadoxA coin-flipping game whose average payout is infinite. Expected value says you should hand over your house, your savings and everything else to play once. Nobody would pay twenty pounds. Nearly three centuries later, why not is still argued about.
- 1785The Condorcet ParadoxThree people vote. A majority prefers A to B, a majority prefers B to C, and a majority prefers C to A. The group has no favourite at all — and whoever sets the order of the votes decides the winner.
19th Century
1800 – 1900 · 8 entries
- 1610 (Kepler), 1744 (de Chéseaux), 1823 (Olbers)Olbers' ParadoxIf the universe were infinite, eternal and evenly stocked with stars, every line of sight would end on a star and the whole night sky would blaze like the surface of the Sun. It does not. The reason is that the universe has not been here long enough.
- 1847Semmelweis ReflexNew knowledge contradicting established beliefs is rejected reflexively, even when overwhelming. Semmelweis showed handwashing reduced childbed fever deaths from 10% to under 2%. The medical establishment dismissed him, and his discovery went unused for a generation while thousands died of preventable infections.
- 1865The Jevons ParadoxMake engines burn less coal and the country burns more coal. Jevons argued in 1865 that efficiency does not save a resource — it makes the resource cheaper to use, and cheap things get used more.
- 1867 (letter to Tait), 1871 (published in Theory of Heat)Maxwell's DemonA tiny doorkeeper sorts fast molecules from slow ones and makes a hot room and a cold room out of a lukewarm one, for free. It took 115 years to find the bill: the demon must eventually erase its own memory, and erasing costs heat.
- 1889Bertrand's Box ParadoxThree boxes, two drawers each: two gold coins, two silver, one of each. You open a drawer and find gold. The chance the other drawer in that box is also gold is 2/3, not 1/2 — and this is exactly the Monty Hall problem, posed a century earlier.
- 1891Cantor's Diagonal ArgumentHand over any list claiming to contain every infinite sequence of digits. Reading down the diagonal and changing each entry produces a sequence that is not on it. No list can be complete, so some infinities are bigger than others.
- 1895 (Marshall's third edition); 2008 (first credible field evidence)The Giffen ParadoxBread gets more expensive, so the poorest families buy more of it. Demand curves are supposed to slope down. For a century the exception had a name, a theory, and no confirmed example anywhere in the world.
- 1896Pareto PrincipleRoughly 80% of consequences come from 20% of causes. Eighty percent of a country's wealth is held by 20% of its population. Eighty percent of software bugs come from 20% of the code. The ratio varies, but the principle — that a small minority of causes drives the vast majority of effects — recurs everywhere.
20th Century
1900 – 2000 · 74 entries
- 1900Cobra EffectA solution designed to reduce a problem ends up increasing it, because the incentive rewards the very thing it was meant to eliminate. Named from the British cobra bounty in colonial India: citizens farmed snakes for the reward, and when the scheme was cancelled, released them — leaving more cobras than before.
- 1901 (discovered), 1902 (letter to Frege), 1903 (published)Russell's ParadoxCollect every set that does not contain itself. Does that collection contain itself? Either answer contradicts the other. The question destroyed the leading attempt to found mathematics on logic, and forced set theory to be rebuilt.
- 1759 (novel), 1903 (paradox formulated)The Tristram Shandy ParadoxTristram Shandy takes two years to write about each day of his life and falls ever further behind. But Bertrand Russell showed that given infinite time he would write about every day — because days and years are both countably infinite and can be matched one-to-one, however wide the gap grows.
- 1905 (the physics), 1961 (first prominent published version)The Ladder ParadoxA ladder too long for a garage fits inside it when you run fast enough, because it contracts. But from the ladder's view the garage contracts instead, so it cannot possibly fit. Both accounts are right, and "at the same time" is what gives.
- 1906 (published by Russell, crediting Berry); communicated c. 1904Berry's Paradox"The smallest positive integer not definable in under sixty letters." That phrase has fifty-seven letters, so it defines the very number it says cannot be defined. The way out is that "definable" cannot mean what it seems to.
- 1908The Grelling-Nelson ParadoxCall a word "autological" if it describes itself — "short" is short, "English" is English. Call a word "heterological" if it does not — "long" is not long, "French" is not French. Then ask: is "heterological" heterological? If yes, it is autological. If no, it is heterological. The question has no consistent answer.
- 1905 (implicit in Einstein), 1911 (Langevin's traveller)The Twin ParadoxOne twin flies to a distant star and back; the other stays home. The traveller returns younger. Each twin saw the other's clock running slow, so why is the answer not symmetric? Because they took different routes through spacetime.
- 1913Ringelmann EffectAs group size increases, each individual exerts less effort. Two people pulling a rope don't pull twice as hard as one; eight people don't pull eight times as hard. The effect is not just coordination: individuals genuinely work less hard when others are present.
- 1918 (Russell's lectures); the story circulated earlierThe Barber ParadoxA barber shaves everyone who does not shave himself, and nobody else. So who shaves the barber? The honest answer is not a paradox at all — it is a proof that no such barber can exist, and that difference is the whole lesson.
- 1920Halo EffectA single striking trait — beauty, confidence, a firm handshake — floods our judgment of everything else about a person. We rate the likeable candidate as more competent, the confident speaker as more accurate, even when none of those things follow. The halo is invisible to the person wearing it.
- 1924–1932 (studies), 1958 (effect named)Hawthorne EffectPeople change their behaviour when they know they are being observed. Workers in a 1920s factory became more productive with every experimental change — including when changes were reversed — simply because someone was paying attention. The measurement itself changes what is being measured.
- 1924 (lectures), 1947 (popularised)Hilbert's Grand HotelA hotel with infinitely many rooms, every one occupied, can still take in a new guest — and a coachload, and infinitely many coachloads. Being full stops meaning what it means everywhere else.
- 1924The Banach–Tarski ParadoxA solid ball can be cut into five pieces which, moved rigidly and reassembled, form two balls identical to the original. The theorem is proved. The pieces are so ragged that no volume can be assigned to them at any stage.
- 1929Chesterton's FenceDo not remove a fence until you understand why it was built. If you cannot explain why it exists, you do not understand it well enough to know what removing it will break. Seeming pointlessness is evidence of ignorance, not evidence of pointlessness.
- 1931Gödel's Incompleteness TheoremsAny consistent set of rules rich enough to describe arithmetic contains true statements it cannot prove — and cannot prove its own consistency. A precise theorem about formal systems, and the most misquoted result in mathematics.
- 1935Schrödinger's CatA cat in a sealed box, its fate tied to a single radioactive atom, is supposedly both alive and dead until someone looks. Schrödinger invented the scene to show that this way of talking is ridiculous — and physics has been arguing about why ever since.
- 1935 (argument), 1964 (Bell's theorem), 2015 (loophole-free tests)The EPR ParadoxEinstein argued in 1935 that quantum mechanics must be incomplete, because two separated particles seem to know about each other instantly. Thirty years later Bell turned the argument into a testable inequality — and the experiments came back on quantum mechanics' side.
- 1935Zipf's LawIn almost any large text, the most common word appears twice as often as the second most common, three times as often as the third. The same distribution governs city populations, website traffic, income, and earthquakes — with no obvious reason why they should all obey the same rule.
- 1936The Halting ProblemNo program can look at any other program and always correctly say whether it will finish running or loop forever. Turing proved it in 1936 by building a program that does the opposite of whatever it is told about itself.
- 1936The Paradox of ThriftWhen every household saves more money at once, the result is less saving in the economy as a whole. The individual virtue of thrift, multiplied across an entire economy, produces the collective vice of falling income and empty factories. What is rational for one is destructive for all.
- 1938Benford's LawIn almost any large collection of real-world numbers — populations, prices, river lengths, stock prices — the digit 1 appears as the leading digit about 30% of the time. The digit 9 appears only 5% of the time. Expected each digit equally at 11%? Almost every dataset proves you wrong, and the law catches fraudsters.
- 1939 (first published), circulating from the 1920sThe Birthday ProblemIn a room of just 23 people, there is a better than even chance that two of them share a birthday. Not 183 people. Twenty-three. The reason is that 23 people make 253 pairs, and every pair is a chance to match.
- 1943 (Barjavel's novel), with antecedents from the 1920sThe Grandfather ParadoxTravel back in time and kill your grandfather before your parent is conceived, and you are never born — so you never travel back, so he lives. The scenario is not obviously impossible in general relativity, which is why physicists have spent decades explaining why it never happens.
- 1943 (in circulation), 1948 (first in print)The Unexpected Hanging ParadoxA judge sentences a prisoner to hang one weekday next week, and promises the day will come as a surprise. The prisoner proves the sentence cannot be carried out. On Wednesday the hangman arrives, and the prisoner is astonished.
- 1945The Paradox of ToleranceIf a society tolerates every view without exception, including views committed to ending toleration, does it survive? Popper's answer is more careful and far more qualified than the version that circulates under his name.
- 1946Berkson's ParadoxTwo unrelated things can look strongly related once you only look at a selected slice. Among hospital patients, among the people you date, among everyone you hired — the selection itself invents the correlation.
- 1949Murphy's LawAnything that can go wrong, will go wrong — and at the worst possible moment. Stated as a joke at an Air Force test site in 1949, it spread into engineering culture as a serious design principle: if a component can be installed wrong, someone will install it wrong, so design it to allow only the correct way.
- 1950 (Fermi's remark), 1975 (Hart's argument)The Fermi ParadoxThe Galaxy is old enough that any civilisation inclined to spread should have filled it long ago. Nobody is here and nothing is calling. Which premise is wrong — that life is common, that it spreads, or that we would have noticed?
- 1950The Prisoner's DilemmaTwo suspects are questioned in separate rooms. Each is offered a deal: betray the other and walk free. Each reasons impeccably, each betrays, and both end up worse off than if neither had said a word.
- 1950 (paper), 1951 (book), 1963 (corrected second edition)Arrow's Impossibility TheoremWrite down four things any fair voting system should obviously do. Arrow proved in 1951 that with three or more options, no method of combining ranked preferences can do all four — except one that always follows a single person.
- 1903 (Yule), 1951 (Simpson), 1972 (named)Simpson's ParadoxA treatment can work better for small stones, better for large stones, and still look worse overall. Every group prefers one thing and the total prefers the other. The arithmetic is correct both times.
- 1952 (posed at the Paris colloquium), 1953 (published)The Allais ParadoxTwo pairs of gambles, offered minutes apart. Most people — including the economists who wrote the theory — choose in a way that no expected-utility maximiser can. Allais built the questionnaire in 1952 to catch exactly that.
- 1953 (Littlewood, crediting Schrödinger), 1989 (envelope form)The Two Envelopes ProblemTwo envelopes, one holding twice the other. You pick one, and a short calculation says the other is worth 25% more — so you should swap. But the same calculation applies to the envelope you just swapped into, and you could swap forever.
- 1955Parkinson's LawWork expands to fill the time available for its completion. A task that could take an hour, given a week, will take a week — not because the work grows, but because anxiety, iteration, and perfectionism fill the container. Stated as satire about bureaucracy in 1955, it has since been supported by research.
- 1955Placebo EffectA sugar pill, a saline injection, sham surgery — if a patient believes they are receiving treatment, they often improve. Not just subjectively: measurable physiological changes occur. The belief that you are being treated can produce real healing.
- 1959 (posed), 1961 (retracted in part)The Boy or Girl ParadoxA family has two children and at least one is a boy. What is the chance both are boys? Martin Gardner said 1/3 in 1959, then conceded it could equally be 1/2. The answer depends on how you learned the fact — and the puzzle never says.
- 1961The Ellsberg ParadoxAn urn has 30 red balls and 60 black-or-yellow balls in unknown proportions. People prefer red over black, yet black-or-yellow over red-or-yellow — two choices that no single probability can justify, proving that unknown odds feel different from known ones even when expected values are identical.
- 1963 (discovery), 1972 (butterfly metaphor coined)The Butterfly EffectA butterfly flapping its wings in Brazil might set off a tornado in Texas — not by force, but because tiny differences in initial conditions compound into completely different outcomes. The future is fundamentally unpredictable past a short horizon, even in a perfectly deterministic universe.
- 1965Moore's LawSince the integrated circuit, transistor counts on a microchip have roughly doubled every two years while costs halved. Gordon Moore noticed this in 1965 and predicted it would continue. It did — for fifty years. The pace is now slowing, but the law reshaped every industry on Earth while it held.
- 1951 (Richardson), 1967 (Mandelbrot)The Coastline ParadoxThe length of a coastline depends entirely on the length of the measuring stick. Use a shorter ruler and you find a longer coast, because you can trace more of its bays and inlets. There is no fact of the matter about how long Britain's coastline is — only answers relative to a scale of measurement.
- 1968Braess's ParadoxOpen a fast new road between two points and every driver's journey gets longer. Close a busy street and the traffic speeds up. Dietrich Braess proved in 1968 that this is not bad luck — it is what selfish route choice does.
- 1968Bystander EffectThe more people witness an emergency, the less likely any one of them is to help. Not because they do not care, but because each person assumes someone else will act — and the responsibility, spread across the crowd, falls through the cracks entirely. The safest place to need help is an empty street.
- 1968Conway's LawAny organisation that designs a system produces a design whose structure mirrors the organisation's communication structure. Teams build systems that reflect how they talk to each other — not by plan, but because the natural division follows the organisational boundary.
- 1968Matthew EffectSmall early advantages compound into large inequalities, even when later performance is equal. The researcher cited first gets cited more; the child who reads earliest reads more and learns faster. Named from Matthew 25: "To everyone who has, more will be given; from him who has not, even what he has will be taken."
- 1968Pygmalion EffectWhen someone in authority expects you to succeed, you tend to — not because they predicted correctly, but because their expectation changes how they treat you, which changes what you become. The teacher who believes a student is bright creates a brighter student. The prophecy fulfils itself.
- 1968The Tragedy of the CommonsA shared pasture, and every herder gains by adding one more animal while the cost of the extra grazing falls on everybody. Garrett Hardin called the ruin inevitable. Elinor Ostrom spent thirty years documenting communities where it was not.
- 1968–1969Levinthal's ParadoxA protein chain has more possible shapes than there are atoms in the galaxy. If it tried them one at a time it could not find the right one before the universe ended. It finds it in millionths of a second, every time.
- c. 1960 (posed), 1969 (published)Newcomb's ProblemA near-perfect predictor has already filled two boxes based on what it thinks you will do. Take both boxes or only the opaque one? Expected utility says one box; dominance says two. Both arguments are impeccable. They disagree.
- 1963 (observed), 1969 (published)The Mpemba EffectUnder some conditions, hot water freezes faster than cold water starting at the same environmental conditions. The effect is real and reproducible, but after sixty years of research the mechanism remains genuinely contested, making this the rare physical paradox that is both confirmed and unexplained.
- 1969The Peter PrincipleIn a hierarchy, every employee tends to rise to their level of incompetence. A person good at their job is promoted; if good at that, promoted again — until reaching a position they cannot handle, where they stay. The result: senior positions are disproportionately occupied by people unequipped to hold them.
- 1971 (named), 2001 (renamed the C-value enigma)The C-value ParadoxAn onion carries about five times as much DNA as you do. A lungfish carries forty times as much. Genome size varies across life by a factor of a hundred thousand and tracks organism complexity hardly at all.
- 1974Anchoring EffectThe first number you hear pulls all your subsequent estimates toward it — even when it is arbitrary. Shown a wheel landing on 65, people estimate Africa makes up 45% of the UN. Shown one landing on 10, they estimate 25%. The number was meaningless. The 20-point gap was not.
- 1974The Abilene ParadoxA family drives fifty-three miles across the Texas heat for a bad cafeteria meal. Afterwards every one of them admits they never wanted to go. Each had agreed only because each believed the others wanted it — so the group did the one thing nobody wanted.
- 1974The Easterlin ParadoxWithin a country, richer people are happier. Yet as whole countries grew far richer over decades, average reported happiness barely moved. Easterlin named the tension in 1974, and economists are still arguing about whether it is real.
- 1975Brooks's LawAdding manpower to a late software project makes it later. New developers need ramp-up time — during which existing developers must train them. More people also multiplies communication channels quadratically. The project falls further behind exactly when adding people feels like the fix.
- 1975 (Goodhart's formulation), 1997 (Strathern's phrasing)Goodhart's LawPick a number that stands in for something you care about, then reward people for moving that number. They will move it. The thing you actually cared about is now free to drift away, and your number will not tell you that it has.
- 1975 (posed), 1990 (made famous)The Monty Hall ProblemYou pick one of three doors. The host opens a different door to reveal a goat, then offers you the chance to switch. Switching doubles your odds of winning — and almost nobody believes it the first time.
- 1975 (proved), 1978 (named)The Two Generals' ProblemTwo allies must agree on a time to attack, but every message between them might be lost. No matter how many confirmations they exchange, the last messenger is never confirmed — and agreement is provably unreachable.
- 1974/75 (Hawking radiation), 1976 (the paradox stated)The Black Hole Information ParadoxBlack holes evaporate. Hawking argued in 1976 that whatever falls in is destroyed with them, which quantum mechanics forbids. Fifty years of work has convinced almost everyone that information survives — without producing an agreed account of how it gets out.
- 1977Amara's LawWe overestimate the effect of technology in the short run and underestimate it in the long run. The internet would transform everything — in two years. Ten years later it had done less than promised. Thirty years later it had done far more than anyone predicted. The pattern repeats for every major technology.
- 1975 (observation), 1977 (Peto's fuller statement)Peto's ParadoxA blue whale has thousands of times more cells than you do and lives about as long. Every cell is a chance for cancer to start. Whales should be riddled with it. They are not — and across species, body size barely predicts cancer at all.
- 1979Hofstadter's LawIt always takes longer than you expect, even when you take Hofstadter's Law into account. This self-referential formulation captures why estimation bias is not correctable by simply knowing about it: you underestimate the correction too. The effect is consistent and found across virtually every domain of complex work.
- 1980Hanlon's RazorNever attribute to malice that which is adequately explained by incompetence. When something goes wrong, the malicious explanation requires extra assumptions — that someone chose to cause harm — that are usually unnecessary. Most harm comes from error, not evil, and the right diagnosis produces better remedies.
- 1980Metcalfe's LawThe value of a network is proportional to the square of its users. Double the network, quadruple the value. This explains why network effects are so powerful — why Facebook moated itself as it grew, why telephone adoption accelerated, and why networked markets tend toward monopoly.
- 1982The Byzantine Generals ProblemLoyal generals must agree on a plan while traitors among them send different stories to different people. With unsigned messages, agreement is impossible unless more than two-thirds are loyal — and signatures change the bound entirely.
- 1984Flynn EffectIQ scores have been rising in virtually every country measured, by roughly 3 points per decade. The gains are too large and fast to be genetic. Something in the environment is making IQ test performance steadily improve. We don't fully know what, or what it means.
- 1985Sunk Cost FallacyWe keep investing in failing projects because of what we have already spent — even though past investment cannot be recovered and should be irrelevant. The rational rule is to decide on expected future costs and benefits. The psychological reality is we cannot stop throwing good money after bad.
- 1985The FLP Impossibility ResultIn a network with no timing guarantees, no deterministic protocol can promise that a group of computers will ever agree on anything — if even one of them might crash. Not slow, not unlikely: impossible.
- 1987 (Solow's remark), debate ongoingThe Productivity ParadoxOffices filled with computers through the 1970s and 1980s. The statistics that measure how much a worker produces per hour barely moved. Robert Solow put it in one line in 1987, and forty years later the argument about what it means is still running.
- 1988Moravec's ParadoxChess grandmaster play took a computer forty years. Picking up an unfamiliar object off a cluttered table still is not solved. The skills we think of as hard are computationally cheap; the ones a toddler has are not.
- 1988The Ross-Littlewood ParadoxAdd ten numbered balls to a vase, remove one, repeat infinitely. After every step the vase grows by nine. After infinitely many steps the vase is empty — because every specific ball was eventually removed, even though the count grew without bound at every finite stage.
- 1991The Friendship ParadoxOn average, your friends have more friends than you do. So do almost everybody's. It is not a comment on you — it is a fact about how counting works, and it is true in essentially every real social network.
- 1992Dunbar's NumberThe human brain can maintain stable social relationships with approximately 150 people — the same count found in hunter-gatherer bands, Roman army companies, and Christmas card lists. Beyond that, groups need formal rules to stay coherent. The limit is cognitive, built into the primate neocortex.
- 1999Dunning-Kruger EffectPeople with limited skill in a domain overestimate their ability; the highly competent underestimate theirs. The cause is recursive: the skills needed to perform well are the same ones needed to recognise good performance. Low performers lack the tools to see their own incompetence.
Contemporary
2000 – today · 7 entries
- 2000 (conjectured), 2002 (proved)The CAP TheoremAlmost everyone states it as "pick two of consistency, availability and partition tolerance". That is wrong. Partitions are not a choice, and the real trade-off only exists while the network is broken.
- 1997 (posed), 2000 (named and popularised)The Sleeping Beauty ProblemA fair coin is tossed. Heads, you are woken once; tails, twice, with your memory erased in between. You wake with no idea which day it is. How confident should you be that the coin landed heads? Philosophy has not agreed.
- 2003 (incident), 2005 (term coined)Streisand EffectAttempting to suppress information reliably causes it to spread far more widely. The suppression attempt itself becomes the news, attracting far more attention than the original content. Named after Barbra Streisand's 2003 lawsuit to remove aerial photos — which caused millions to seek them out.
- 2004 (the book); 2000 (the jam study)The Paradox of ChoiceMore options should mean better outcomes. A famous experiment with jam suggested the opposite, and a bestselling book turned it into common knowledge. Then the meta-analyses arrived and found almost nothing. What survives is smaller, stranger and more useful.
- 2006Baader-Meinhof PhenomenonLearn a new word, hear a new concept, buy a new car — and suddenly it seems to appear everywhere. The world hasn't changed. Your perception has. Two cognitive biases cooperate: selective attention makes you notice the thing once familiar, and confirmation bias logs each occurrence as evidence it really is everywhere.
- 2010Cunningham's LawThe best way to get the right answer on the internet is not to ask a question — it is to post the wrong answer. People who would not bother helping someone who asked politely will spend considerable effort correcting someone who is confidently wrong. The correction instinct is stronger than the helping instinct.
- 2013Brandolini's LawThe energy needed to refute misinformation is an order of magnitude larger than the energy needed to produce it. A false claim takes seconds. Refuting it requires evidence, context, and defence against follow-up objections. The asymmetry structurally favours misinformation.