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Mind & Everyday

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21 days to form a habit? The study says otherwise.
In 2010 Phillippa Lally tracked 96 people who repeated a new routine daily, such as drinking a glass of water with …
A spinning wheel changes how many African UN states you guess.
In 1974 Tversky and Kahneman spun a rigged wheel that stopped at 10 or 65. Participants then estimated the share of …
Quickly checking email costs more than the minute.
Sophie Leroy showed in 2009 that switching from an unfinished task to a new one leaves part of your attention stuck on …
You're not searching for truth, you're searching for confirmation.
Confirmation bias means you notice, remember and actively seek information that fits what you already believe. Peter …
One checkbox on a form decides organ donor rates.
In 2003 Johnson and Goldstein compared European countries. Where people must actively opt in, 4 to 28 percent were …
Dopamine isn't a pleasure chemical, it's a surprise signal.
In 1997 Wolfram Schultz recorded dopamine neurons in monkeys. They fired at unexpected juice. Once a light reliably …
People who know little often can't tell.
Dunning and Kruger found in 1999 that participants in the bottom quarter on logic and grammar tests rated themselves …
Willpower as a draining battery: a theory that failed the test.
From 1998 Roy Baumeister argued that self-control is a limited resource that drains like a battery. Over 100 studies …
200 saved or 400 dead: same numbers, opposite decision.
In 1981 Tversky and Kahneman described a disease threatening 600 people. Program A saves 200 for sure. Program B saves …
The tailgater is a jerk, you were just stressed.
You explain other people's behaviour by their character and your own by the situation. In 1967 Jones and Harris had …
Visual learner? Research finds no evidence.
In surveys, over 90 percent of teachers believe people learn better when material matches their learning style. In 2008 …
Highlighting and rereading: the most popular study methods work least.
In 2013 Dunlosky and colleagues rated ten learning techniques against hundreds of studies. Highlighting, underlining …
The marshmallow test says less about kids than we thought.
In the 1970s Walter Mischel found that children who could wait for a second marshmallow were more successful later on. …
You like things simply because you've seen them before.
In 1968 Robert Zajonc showed participants Chinese characters at different frequencies. The more often a character …
A 99 percent accurate test, and you're still probably healthy.
A disease affects 1 in 10,000. The test detects it 99 percent of the time and gives 1 percent false alarms in healthy …
Once a metric becomes the target, it stops working.
Goodhart's law: when a measure becomes a target, it ceases to be a good measure. Pay programmers per line of code and …
Nobody ignored you. They forgot your message.
Hanlon's razor: never attribute to malice that which is adequately explained by stupidity. The unanswered email, the …
Don't ask how to win. Ask how to lose for sure.
Inversion flips the problem. Instead of "How do I become productive?" you ask "How do I guarantee a ruined day?": phone …
The map is not the territory, and your model isn't the world.
Alfred Korzybski put it in 1931: the map is not the territory. Every map leaves things out, or it would be as large as …
The explanation with the fewest assumptions usually wins.
William of Ockham stated in the 14th century that one shouldn't multiply assumptions beyond necessity. If your car …
20 percent of your work delivers 80 percent of the result.
Vilfredo Pareto noticed in 1896 that 20 percent of Italians owned 80 percent of the land. The pattern shows up …
Imagine the project has failed. Now explain why.
Gary Klein developed the pre-mortem: before starting, the team imagines a year has passed and the project has failed …
Good enough beats perfect, and makes you happier.
Herbert Simon coined the term satisficing in 1956: instead of hunting for the best option, you set a threshold in …
And then what? The question most decision-makers skip.
First-order thinking sees the direct effect: a bounty on rats reduces rats. Second-order thinking asks "And then?": in …
The money's gone whether or not you finish the film.
Sunk costs are paid and won't come back: the 12-euro cinema ticket, three years in the wrong degree. Rationally, only …
Odysseus had himself tied up because he didn't trust himself.
To hear the Sirens' song without drowning, Odysseus had himself bound to the mast and ordered his crew not to release …
Endure pain for longer and still prefer it.
In 1993 Kahneman had participants hold a hand in 14-degree water for 60 seconds. In a second trial: the same 60 seconds …
Why your deadline always takes longer than planned.
In 1994 Buehler and colleagues asked students when they'd finish their thesis. The average estimate was 34 days …
Power posing is considered debunked, despite 70 million views.
In 2010 Carney, Cuddy and Yap reported that two minutes in an expansive pose raised testosterone and risk-taking. A …
Words about old age don't make you walk slower.
In 1996 John Bargh reported that people who unscrambled words like "Florida" and "wrinkle" then walked more slowly to …
Why you recall a list's start and end, not its middle.
Learn a list of 15 words and you'll recall the first and last ones best. The first ones you had time to rehearse, so …
Your phone distracts you even when it's off.
In 2017 Ward and colleagues gave about 800 people concentration tests. Their silenced phone was either on the desk, in …
Same study time, twice the retention.
Spread 60 minutes of studying over several days instead of one evening and you'll remember far more. Hermann Ebbinghaus …
The bullet holes nobody saw saved the bombers.
In the Second World War the US military wanted to armour planes where returning aircraft had the most bullet holes. …
Testing yourself beats rereading, even though it feels worse.
In 2006 Roediger and Karpicke had students either read a passage four times, or read it once and write it from memory …
Half the viewers missed a gorilla walking through the frame.
In 1999 Simons and Chabris showed a video of players passing a basketball. The task: count the passes. Meanwhile a …
Why pigeons, slot machines and your feed use the same trick.
B. F. Skinner found that if you reward a pigeon not for every peck but unpredictably, it pecks far more often and …
Why sharks feel more dangerous than the water itself.
Your brain judges probability by how easily examples come to mind. Anything dramatic and in the news feels frequent. …
After a day, most of it is gone, but not all.
In 1885 Ebbinghaus memorised nonsense syllables and tested how much he still knew. After 20 minutes about 40 percent …
Losing 100 euros hurts more than winning 100 euros feels good.
Kahneman and Tversky showed that losses weigh roughly twice as heavily as equal gains. Most people refuse a bet with a …
How you hear your name in a crowded room.
In noise, your brain isolates one voice using direction, pitch and rhythm. The rest isn't deleted, just processed …
How a feed keeps you without you noticing.
Three mechanisms interlock. Variable reward: you never know if the next post is good, so you keep scrolling. No …
How a habit forms from three parts.
A habit is made of a cue, a routine and a reward. The cue is a place, a time, a feeling or a previous action. The …
How mixed practice feels slower but scores higher on the test.
In 2007 Rohrer and Taylor had students practise volume formulas: one group in blocks, one solid shape at a time, the …
How motivation arises when nobody's paying you.
Deci and Ryan identified three basic needs that feed intrinsic motivation: autonomy, meaning you choose; competence …
How your brain decides at night what you'll keep.
During deep sleep the hippocampus replays the day's activity patterns at high speed and gradually transfers them to the …
How flashcard apps decide when you see a card again.
Every card gets an interval. Answer correctly and it grows, roughly from 1 to 3, 7, 16, 35 days. Fail and it resets to …
How an if-then sentence makes your goals stick.
Peter Gollwitzer calls it an implementation intention: instead of "I want to exercise more" you say "When I get home on …
How to listen so someone feels understood.
Active listening goes back to Carl Rogers and has three parts. First, full attention – phone away, eye contact. Second …
Facts don’t actually make people dig in.
For years it was said that corrections strengthen false beliefs (the “backfire effect”). Wood and Porter tested this in …
Your strongest negotiating weapon is plan B.
BATNA stands for “Best Alternative To a Negotiated Agreement” – your best option if the negotiation fails. Fisher and …
Group brainstorming produces fewer ideas than working alone.
In 1987 Diehl and Stroebe compared groups of four with four people working alone and pooling their ideas. The …
Refuting nonsense costs ten times more than producing it.
Brandolini’s law, coined in 2013 by programmer Alberto Brandolini: the energy needed to refute nonsense is an order of …
More witnesses, less help – usually.
A 2011 meta-analysis of 105 studies confirms the bystander effect: in groups, everyone feels less responsible, and …
Two circles that decide whether you wear yourself out.
Stephen Covey separates the circle of concern – everything on your mind – from the smaller circle of influence, where …
Creativity has two gears – don’t use both at once.
In 1956 psychologist J. P. Guilford distinguished divergent thinking – generating many possible answers – from …
Four boxes that separate urgent from important.
The Eisenhower matrix, named after a quote from the US president, sorts tasks along two axes: important and urgent. …
Whoever names a number first usually wins.
In 2001 Galinsky and Mussweiler had pairs negotiate over a factory. When the buyer made the first offer, the final …
Why experts are such poor explainers.
In 1990 Elizabeth Newton had people tap out well-known songs on a table. The tappers estimated listeners would …
Why a tiny request sets up the big one.
In 1966, Freedman and Fraser asked homeowners to put a huge “Drive Carefully” sign in their front yard. Only 17% …
How one word for your feeling calms the amygdala.
Lieberman and colleagues showed in a 2007 brain-imaging study: people who see a fearful face and label it with the word …
You come up with far more ideas while walking.
In 2014 Oppezzo and Schwartz had people generate unusual uses for everyday objects while sitting or walking. Walking – …
How to voice criticism in four steps without attacking.
Marshall Rosenberg’s Nonviolent Communication uses four steps: observation without judgement (“the dishes have been …
The single behaviour that pushes couples apart most.
John Gottman observed couples in his lab for decades and described four warning signs: criticism, defensiveness …
What is asserted without evidence can be dismissed without evidence.
Hitchens’s razor, named after writer Christopher Hitchens, sums up the burden of proof: whoever makes a claim has to …
How a sentence opener defuses an argument.
Thomas Gordon described the I-message in the 1960s: instead of “you never listen” you say “I feel overlooked when I’m …
Your nerves are far less visible than you think.
Gilovich, Savitsky and Medvec showed in 1998 that people greatly overestimate how well others can read their inner …
The answer arrives in the shower – for good reason.
In 2009 Sio and Ormerod pooled 117 studies on the incubation effect in a meta-analysis: people who set a problem aside …
Your 4 p.m. coffee is still half there at midnight.
Caffeine blocks adenosine receptors – adenosine is the signal that builds up sleep pressure across the day. Its …
They liked the conversation more than you think.
In 2018 Boothby and colleagues had strangers talk, then estimate how much the other person liked them. Nearly everyone …
You like things simply because you see them often.
Starting in 1968, Zajonc showed that people rate a symbol, face or word more positively the more often they see it – …
Multitasking doesn’t exist – only rapid switching.
The brain doesn’t process two demanding tasks in parallel; it toggles between them. Every switch costs time to reload …
How a 25-minute kitchen timer fights procrastination.
Francesco Cirillo developed the technique in the late 1980s with a tomato-shaped kitchen timer: 25 minutes on one …
Why a 10-minute nap works better than 30 minutes.
In 2006 Brooks and Lack compared naps of 5, 10, 20 and 30 minutes. The 10-minute nap produced the strongest and …
Read every statement in its most reasonable interpretation first.
The principle of charity from philosophy says: when a statement is ambiguous, choose the reading under which it is most …
Ask your 80-year-old self before you decide.
Jeff Bezos described the regret minimization framework for his 1994 decision to leave a safe job for Amazon: imagine …
How seven questions turn one idea into ten.
SCAMPER is Bob Eberle’s 1971 checklist for generating ideas. Take an existing product and ask: Substitute – replace …
You cross time zones every week – without a plane.
Social jet lag, a term coined by chronobiologist Till Roenneberg, is the gap between your mid-sleep on workdays and on …
Nobody noticed your embarrassing T-shirt. Really.
In 2000 Gilovich had students wear a Barry Manilow shirt into a seminar room. They estimated about half the people …
The opposite of a straw man – and why it makes you smarter.
Steelmanning means stating the opposing view in its strongest form – so well that the other side says “yes, that’s …
The argument you never actually made.
A straw man appears when someone restates your position in a distorted form and then refutes the distortion. You say …
How to use your favourite podcast as exercise bait.
In 2014 Milkman, Minson and Volpp gave students gripping audiobooks they could only listen to at the gym. That group …
How to put to-dos in your calendar instead of on lists.
With timeboxing you give each task a fixed time slot in your calendar in advance – say “report: Wednesday 9–11 a.m.”. …
Ask for something absurd first, then the real thing.
In 1975 Cialdini asked students to mentor teenagers weekly for two years. Almost everyone refused. Right after, he …
“But what about…?” – the answer that isn’t one.
Whataboutism is a form of the tu quoque fallacy: instead of rebutting an accusation, you point at someone else’s …
The invisible corridor every deal lives in.
The ZOPA (Zone of Possible Agreement) is the range between the maximum a buyer would pay and the minimum a seller would …
How to clear small stuff instantly instead of managing it.
David Allen’s two-minute rule from “Getting Things Done”: if a task takes under two minutes, do it immediately. Writing …
Three lines, one obvious answer, and still many gave the wrong one.
In 1951 Solomon Asch asked participants which of three lines matched a reference line. The task was trivial. But the …
A warm lecturer also looks more attractive. Same man, same face.
In 1977 Nisbett and Wilson showed students two videos of the same lecturer with a Belgian accent: once friendly, once …
Lottery winners are barely happier a year later than before.
In 1978 Brickman, Coates and Janoff-Bulman compared 22 lottery winners, 29 accident victims with paralysis and a …
Feeling you're about to be exposed as a fraud is surprisingly common.
In 1978 Pauline Clance and Suzanne Imes described the impostor phenomenon in 150 successful women: they credited their …
Lying for one dollar makes the lie more convincing. To yourself.
In 1959 Festinger and Carlsmith had students do a mind-numbing task, then tell the next participant it was exciting …
24 jams drew more shoppers, 6 jams sold more.
In 2000 Iyengar and Lepper alternated a tasting table of 6 and 24 jams in a supermarket. The large table drew 60 …
The state where you forget the clock has a recipe.
Mihaly Csikszentmihalyi called it flow: full concentration, sense of time gone, action and awareness merging. His …
Work expands to fill the time available for its completion.
Cyril Northcote Parkinson wrote the line in 1955 in a satirical Economist essay, after watching the British naval …
Forbid something and it suddenly becomes attractive.
Jack Brehm described reactance in 1966: when your freedom feels threatened, you want exactly what is being restricted …
A free Coke sold almost twice as many raffle tickets.
In 1971 Dennis Regan had participants rate pictures alongside a supposed fellow participant. During a break he returned …
How to spend hours a day actually thinking instead of reacting.
Cal Newport calls focused, distraction-free work on hard tasks deep work. His recipe: block fixed slots in your …
How a Monday helps you start, and so does a birthday.
In 2014 Dai, Milkman and Riis found people prefer to start goals at temporal landmarks: searches for "diet" rose 82 …
How to build confidence in yourself without talking yourself into it.
In 1977 Albert Bandura described self-efficacy: the belief that you can accomplish a task. It draws on four sources …
39 students got the same personality profile. All found it accurate.
In 1949 Bertram Forer gave his 39 students supposedly individual assessments – in fact the identical text, assembled …
The same mug is worth twice as much once it's yours.
In 1990 Kahneman, Knetsch and Thaler handed mugs to half the participants. Owners demanded about $7 to sell, buyers …
Where were you that day? Your answer drifts, your confidence doesn't.
Starting 12 September 2001, Talarico and Rubin repeatedly asked students about their memory of the attacks. Details …
The person you're talking to got swapped. You don't notice.
In 1998 Simons and Levin had a stranger ask pedestrians for directions. Two workers carried a door between them and the …
You clearly remember a word that was never said.
Hear "bed, rest, awake, tired, dream" and many people also recall "sleep" – which never appeared. Roediger and …
The famous 150 friends is a very shaky number.
Robin Dunbar extrapolated from brain size and group size across 38 primate genera to about 150 stable human …
Explain how a zipper works. In detail.
In 2002 Rozenblit and Keil asked students to rate how well they understood everyday devices, then to explain step by …
Nothing matters as much as it seems while you consider it.
In 1998 Schkade and Kahneman asked whether people in California are happier. Respondents in the Midwest and in …
You don't use 10 percent of your brain. You use all of it.
Imaging shows activity across all brain regions, including during sleep. The brain is about 2 percent of body weight …
How one student took his digit span from 7 to 80.
Chunking means grouping single items into meaningful units. Working with Anders Ericsson for over two years, the runner …
How one question turns rote learning into understanding.
For each new fact ask "why is this true?" and answer it yourself. In 2013 Dunlosky and colleagues rated this technique …
How to come across as likeable without talking about yourself.
Huang and colleagues showed in 2017 that people who ask more questions are liked more. Follow-up questions that build …
How to find out that your estimates are too narrow.
Don't estimate a value, estimate a range you're 90 percent sure contains the truth. If you were calibrated, the answer …
How to store a list in your flat and find it again.
Pick a route you could walk blindfolded: door, hallway, kitchen, sofa. Turn each list item into an image as absurd as …
How to combine positive thinking with the obstacle.
Four steps: name the wish, picture the best outcome, find the main inner obstacle, then build an if-then plan against …
How to remember intentions instead of thinking about them.
Remembering to do something later works far better when an external event supplies the trigger than when you have to …
How to give feedback that doesn't land as a verdict.
The Center for Creative Leadership's SBI model has three parts: name the situation (when, where), describe the …
How one pronoun calms your head before a performance.
In your head, talk about the situation not as "I" but using your own name or "you". In 2014 Ethan Kross and colleagues …
How "do your best" became the worst goal there is.
Locke and Latham reviewed some 400 studies over 25 years. The result: specific, hard goals beat vague or easy ones in …
Assembled it yourself? Suddenly it's worth 63 percent more.
Norton, Mochon and Ariely had people either assemble furniture themselves or inspect pre-built pieces. The builders …
Your first years were erased, not never recorded.
Most adults date their earliest memory to age three or four; before about 3.5 years almost nothing survives. Back in …
Two conditions can never be likelier than one.
Linda is 31, outspoken, studied philosophy and joined anti-nuclear protests. Is she more likely a bank teller, or a …
Divers forgot underwater what they had learned on the beach.
In 1975 Godden and Baddeley had divers learn 36 words either on the beach or underwater, then recall them. Recall in …
Pick your own ticket, charge four times as much. Same odds.
In 1975 Ellen Langer let office workers either choose a lottery ticket or receive one at random. Those who chose …
Pay someone to draw, and afterwards they draw less.
Lepper, Greene and Nisbett showed in 1973 that children given an announced reward for voluntary drawing later drew less …
There are no left-brained and right-brained people.
In 2013 Nielsen and colleagues scanned the resting-state networks of over 1,000 brains. They found no individuals whose …
People spot lies 54 percent of the time. A coin flip gets 50.
In 2006 Bond and DePaulo pooled some 206 studies with 24,483 judges. On average they were right 54 percent of the time. …
Your eyes can decide which syllable you hear.
Harry McGurk and John MacDonald showed in Nature in 1976: hear "ba-ba" while watching lips form "ga-ga" and you …
"93 percent of communication is body language" – never what he meant.
Albert Mehrabian's 7, 38 and 55 percent come from two 1967 studies using single spoken words like "dear", female …
Nearly half your day, you're thinking about something else.
In 2010 Killingsworth and Gilbert sampled 2,250 adults at random moments via an app. In 46.9 percent of samples their …
A single verb changes what witnesses claim they saw.
Loftus and Palmer showed a crash film in 1974. Asked how fast the cars were going when they "smashed", viewers averaged …
Why the simplest strategy won a tournament full of tricks.
In the prisoner's dilemma betrayal pays in one round, but mutual cooperation pays both more over time. Robert Axelrod …
Everyone nods. Nobody is convinced.
Irving Janis described eight signs in 1972: illusions of invulnerability, rationalising warnings away, stereotyping …
Meet a stranger in New York, no messages allowed. Where?
Thomas Schelling posed this in 1960 in The Strategy of Conflict. Most of his students said noon at Grand Central …
Every decision under uncertainty has four possible outcomes.
Hit, miss, false alarm, correct rejection: signal detection theory, born from 1950s radar research, separates two …
Two gears in your head: one fast, one expensive.
System 1 answers instantly, effortlessly and emotionally; System 2 works slowly, deliberately and costs attention. The …
Shoot first, then paint the target around the holes.
The fallacy arises when you search data for patterns and only then form the hypothesis. A 1993 Swedish study tested …
"The light is green" – four messages in four words.
Friedemann Schulz von Thun described this in 1981: every utterance has four sides – factual content, self-revelation …
Fewer than 10 percent solve this four-card task.
Four cards show 3, 8, blue and red. Rule: "if a card shows an even number, its other side is blue." Which do you turn? …
Playing Mozart doesn't make your child smarter. Nobody claimed it did.
In 1993 Rauscher and colleagues found a brief gain on one spatial subtask that faded after about 15 minutes; IQ was …
Everyone thinks it's wrong. Each believes they're the only one.
In 1993 Prentice and Miller surveyed students about campus drinking. Nearly all believed their peers were far more …
Why your favourite music comes from your youth.
Ask older people for life memories and they cluster strikingly between roughly ages 10 and 30. The same pattern shows …
The bigger the group, the quieter you shout.
Latané and colleagues had people shout as loudly as they could. Believing one other person was shouting, they produced …
The most famous prison study is now considered methodologically hollow.
Zimbardo's 1971 study was stopped after six days. In 2019 Thibault Le Texier used the archives to show guards were …
You cannot switch off reading, even when you want to.
When the word RED is printed in blue ink and you must name the ink colour, you stumble. John Ridley Stroop showed this …
The world's most famous advertising experiment never happened.
In 1957 James Vicary claimed flashed messages in a Fort Lee cinema raised popcorn sales by 57.5 and Coca-Cola sales by …
Stare at one point long enough and your surroundings dissolve.
Ignaz Troxler described this in 1804: fixate rigidly on a point and unchanging stimuli at the edge of your visual field …
The famous seven items in your head are more like four.
George Miller named the "magical number seven plus or minus two" in 1956 as working memory's capacity. Nelson Cowan …
Nothing special happens at full moon. You just remember it.
In 1985 Rotton and Kelly pooled 37 studies on lunar phase and behaviour and found no link; of 23 studies claiming one …
Two free stamps make you three days faster.
In 2006 Kivetz, Urminsky and Zheng handed loyalty cards to 108 café customers. One group needed 10 stamps, the other 12 …