Éclat for the smartest girl in the room
Today: why finishing a terrible movie “because you already paid” is a trap your brain sets for you, the sports shirt that became a wardrobe classic, soap’s two-faced molecules, a plant that counts and the one word that exists in every language studied — plus a French phrase for the habits your job gives you and the case of the Saturday that wasn’t.
The Big Idea · Psychology
The Sunk Cost Trap: Why You Keep Going Just Because You Already Started
Imagine you buy a cinema ticket and, thirty minutes in, the film is truly awful. Do you stay? Many people do, because leaving feels like “wasting” the money. But the money is gone either way, so the only real question is whether the next ninety minutes are worth your time. In 1985, psychologists Hal Arkes and Catherine Blumer showed this habit is real: theatre-goers who had paid full price for a season ticket attended more plays early in the season than those who got a discount, even though both groups had the same seats and the same shows. Economists call it the sunk cost fallacy, and it also tripped up governments: Britain and France kept funding the Concorde supersonic jet long after it was clear it would not pay for itself. The fix is surprisingly simple: ask “If I were starting fresh today, would I choose this?”
Arkes & Blumer, “The Psychology of Sunk Cost”, Organizational Behavior and Human Decision Processes (1985)
Why it's cool Once you can spot the sunk cost trap, you will notice it everywhere, from half-finished hobbies to group chats you stay in out of pure momentum.
Read moreThe Polo Shirt Was Designed by a Tennis Champion Who Hated His Stiff Shirt
Before the 1930s, tennis players wore long-sleeved, starched shirts that were beautiful and miserable to move in. René Lacoste, a French champion nicknamed “the Crocodile”, wanted something that let him swing freely and stay cool, so he turned to a short-sleeved shirt made from piqué, a textured cotton knit. The company that carried his name launched the shirt commercially in 1933, with the crocodile embroidered on the chest, and it was one of the first garments to wear a logo outside. That is the trick behind its lasting power: it is sportswear with a collar, so it looks neat without being stiff. Wear it untucked with wide trousers for a relaxed look, or tucked into a pleated skirt to make the whole outfit look deliberate.
Lacoste heritage
Read moreSoap Works Because Its Molecules Are Two-Faced
A soap molecule is shaped like a tiny tadpole: its head loves water, and its tail hates it and loves fat and oil. When you wash your hands, the tails dive into grease and dirt while the heads face the water, so the grime gets wrapped up and rinsed away. Many viruses, including coronaviruses, are wrapped in a fatty membrane, and soap tails can pry that wrapper apart like a crowbar. That is why twenty seconds of ordinary soap and water does so much.
Tell someone Soap isn’t killing germs with poison, it is dismantling their fatty coats with molecules that are half water-lover and half grease-lover.
The Venus Flytrap Can Count
A Venus flytrap does not snap shut at the first tickle, because a raindrop or a bit of dust would waste a lot of energy. Typically it needs two touches in quick succession before the trap closes. German researchers found that the plant keeps tallying the electrical signals from the struggling prey, and the more signals it counts, the more digestive enzymes it produces and the more nutrients it takes up. In other words, it judges how big the meal is before it pays for it. (Later research shows the two-touch rule is not always required, so it is a strong tendency, not a law.)
Tell someone A Venus flytrap has no brain, but it counts touches and only spends energy on digestion when the meal is worth it.
“Huh?” Is Basically the Same Word Everywhere
Linguists studied how people ask for something to be repeated in 31 spoken languages, from Icelandic to Lao to Mandarin to Cha’palaa, spoken in Ecuador. In every one, they found a very similar little word: a short syllable with an “ah”-like vowel and a rising, questioning tune. The researchers argue it is not an instinctive grunt but a real word, which every child has to learn. They think the languages arrived at it separately, because in a fast conversation the quickest, easiest sound to say is the one that wins.
Tell someone The word “huh?” turns up in languages all over the world, because people everywhere need a quick way to say “wait, say that again.”
The Four Temperaments: A 2,000-Year-Old Personality Test (Mostly Wrong, Weirdly Influential)
Ancient Greek doctors believed the body held four fluids, called humours: blood, yellow bile, black bile and phlegm. Too much of one supposedly gave you a temperament: sanguine (cheerful), choleric (fiery), melancholic (brooding) or phlegmatic (calm). The idea lasted for well over a thousand years, long enough to leave its words in our vocabulary, such as “phlegmatic” and “melancholy”. Then psychologist Hans Eysenck noticed that the four types roughly line up along two dimensions, how outgoing someone is and how easily they feel anxious or upset. Both dimensions survive in the modern Big Five model, which is the one researchers actually use today.
Fine print The humours themselves do not exist, and nobody is a pure type. Modern psychology treats these traits as sliding scales, so the four boxes are a fun history lesson, not a diagnosis.
la déformation professionnelle
day-for-mah-SYOHN pro-feh-syoh-NELL · noun phrase (feminine)
The habits of thought or behaviour you pick up from your job and then carry into everyday life, usually without noticing.
« Ma prof de maths compte les carreaux de la salle de bains : c’est de la déformation professionnelle ! »
My maths teacher counts the tiles in her bathroom: it’s her profession warping her habits!
Literally “professional deformation”. It is gently teasing, so use it for someone who corrects the menu’s spelling, or for yourself when you analyse a film like a literature essay. English speakers borrow the phrase too, which makes it a neat way to sound worldly while making a small joke.
The Case of the Saturday That Wasn’t
On Monday morning, Ms Okafor found the photography club’s camera missing from its locked cupboard. She had counted the equipment on Friday the 5th, and she remembers the date because the next day, the 6th, was her birthday. Three students had keys that weekend, and each offered proof of where they had been. Zoe showed a train ticket stamped “Sunday 7th, 18:10”. Fin showed a climbing-gym receipt marked “Saturday 6th, 14:32”. Hana showed a concert ticket from the town hall, printed by a machine that never gets a weekday wrong, reading “Saturday 7th, 19:30”.
Whose proof cannot be genuine, and why?
Reveal the answer
Hana’s. If Friday was the 5th, then Saturday was the 6th and the 7th was a Sunday, so a machine that never errs could not print “Saturday 7th”. Zoe’s and Fin’s dates both fit the calendar, so only Hana’s ticket must have been faked, and she is the one hiding the truth.
The sunk cost fallacy is why I finished a terrible film I paid for and then felt robbed twice: once by the ticket, once by the ending.
A Venus flytrap counts touches before it closes. Finally, a plant with better impulse control than I have in a bakery.
Linguists found a “huh?” in all 31 languages they studied, which is a relief, because I would hate to be confused in only one of them.
The Three-Second Pause: Answer Better by Answering Slower
When someone asks us a question, we rush, because silence feels awkward. Educator Mary Budd Rowe found that teachers typically waited only about one second after asking a question. When they stretched the pause to three seconds or more, students gave longer, more thoughtful answers, and fewer of them stayed silent. The mechanism is simple: your brain needs a moment to retrieve what you know and sort it into a sentence, and rushing skips that step. A pause that feels endless to you usually looks calm and thoughtful to everyone else. Rowe’s evidence comes mostly from classroom observation decades ago, so treat it as a handy habit rather than a law of nature.
Try it today In one conversation or class today, silently count “one, two, three” before answering a question, then see how your answer changes.
Spotlight
Eunice Newton Foote
In 1856, this American scientist put carbon dioxide and ordinary air in glass tubes, set both in the sun and showed the CO₂ tube heated up more, an early clue to the greenhouse effect. Because she was a woman, her paper was read aloud at a scientific meeting by a man, and her work was largely forgotten until it resurfaced around 2010. More →