Éclat for the smartest girl in the room
Today: why every surprise ending feels like something you “knew all along”, the striped sailor shirt that became a fashion classic, why chilli burns (and what actually puts out the fire), hippos with a built-in sunscreen and the real size of your working memory — plus a French phrase for the spirit of the moment, and the case of the violin that nobody mentioned.
The Big Idea · Psychology
“I Knew It All Along”: The Bias That Rewrites Your Memory
In 1975, psychologist Baruch Fischhoff gave students a short text about a real 19th-century conflict: the war between Britain and the Gurkhas of Nepal. Different groups were told different endings. One group heard that Britain won, another that the Gurkhas won, and others that the war ended in a stalemate. Then everyone was asked how likely each ending had looked beforehand. Whichever ending a group had been told was the true one, they rated as far more predictable. Nobody had been given any extra clues, only the result. This is hindsight bias: once you know how a story ends, your brain quietly rewrites the past so that the ending looks obvious. It is why exam results, match scores and plot twists always seem “so predictable” afterwards. The fix is simple but sneaky: write down your prediction before you find out, because the paper version of you cannot be edited.
Fischhoff (1975), Journal of Experimental Psychology: Human Perception and Performance
Why it's cool Your brain does not just forget what you used to think, it replaces it, and you cannot feel the swap happening.
Read moreThe Breton Stripe: A Sailor’s Uniform That Became a Style Classic
The striped navy-and-white shirt, the marinière, became part of the French Navy’s uniform by a regulation dated 27.03.1858. Many sailors came from Brittany, which is why it is also called a Breton shirt. Sailors liked to say the stripes made someone who fell overboard easier to spot, though that explanation is a tale rather than a documented fact. The shirt crossed into fashion when Coco Chanel, inspired by seaside sailor wear, put a version of it in her Deauville shop around the First World War. Later it was worn by artists and actors, and designer Jean Paul Gaultier made it a signature. Why does it still work? Two colours, a repeating pattern and a practical cut make it a “quiet statement” piece: it looks intentional with almost anything, from jeans to a blazer. Try it under a jacket first and notice how the stripes do the styling for you.
Wikipedia: Breton shirt
Read moreChilli Burns Because It Tricks a Pain Sensor, and Water Can’t Fix It
Chillies contain capsaicin, a molecule that fits a sensor in your nerve endings called TRPV1. That sensor normally warns you about real heat, so capsaicin makes your brain feel “burning” even though nothing is hot. Capsaicin does not dissolve well in water, which is why a gulp of water just spreads it around. It does dissolve in fat, so milk, yoghurt or a spoon of peanut butter usually helps more. Birds lack this sensitivity to capsaicin, which is one reason chillies can spread their seeds through them.
Tell someone Spiciness is not a taste but a false fire alarm in your nerves, and milk is the only thing that reliably switches it off.
Hippos Make Their Own Sunscreen
A hippo’s skin releases a clear fluid that turns red-orange within minutes and later browns, which gave rise to the nickname “blood sweat”. It is neither blood nor sweat. It contains two acidic pigments, hipposudoric acid and norhipposudoric acid. They absorb ultraviolet light, and they also slow the growth of some bacteria in lab tests. Hippos make these pigments whatever they eat, so the sunscreen seems to be built by their own bodies.
Tell someone Hippos are basically walking skincare labs: they produce their own sunscreen and antibacterial lotion.
Your Working Memory Holds About Four Things, Not Seven
You may have heard that people can hold seven things in mind, from George Miller’s 1956 paper “The Magical Number Seven”. Miller himself said that there was nothing magical about it, and later researchers such as Nelson Cowan estimated that young adults can juggle about four chunks at once. A chunk is a meaningful unit: the letters F-B-I count as one chunk, but F, X, Q do not. That is why phone numbers are split into groups, and why experts remember more than beginners: they have bigger chunks stored.
Tell someone Your brain’s “short-term desk” has room for about four items, so the real trick to remembering more is making each item bigger.
l’air du temps
lair dew TAHN · noun phrase
The spirit of the times: the mood, ideas and tastes that are in the air right now and that everyone seems to pick up without being told.
« Ces pantalons larges et ces baskets rétro, c’est vraiment l’air du temps. »
Those wide trousers and retro trainers are really the spirit of the moment.
Literally “the air of the time”. It is close to the German Zeitgeist, but lighter and more poetic, and it is also the name of a famous perfume launched by Nina Ricci in 1948. Use it when you notice that a trend is bigger than any single person, for example in fashion, music or slang.
The Case of the Violin Nobody Mentioned
On Friday afternoon, the school’s antique violin vanished from its locked case in the music room. Principal Hale told the students only that “something valuable has been taken from the music room”, and she asked the teachers not to say more. Three students who had been near the music room that day were questioned. Ben, who has a spare key as the music assistant, said: “I was at football practice, nowhere near it.” Cleo said: “I was in the library the whole time, ask the librarian.” Ada shrugged: “Why would I want an old violin? I can barely play the recorder.” The librarian confirmed that Cleo had been there, and Ben’s coach confirmed practice but admitted Ben had left for ten minutes.
Which student gave themselves away, and how?
Reveal the answer
Ada. The principal never said what was stolen, and the teachers had been asked to keep quiet, so only the thief could have known it was a violin. Ben’s ten-minute absence and his spare key are a red herring, since he never mentioned the instrument.
Working memory holds about four items, which is why I walk into a room, forget why I came, and then forget which room it was.
Hindsight bias is when you say “I knew it!” about a surprise quiz you definitely did not revise for.
Capsaicin is the only chemical that can make you cry, sweat and ask for more in under ten seconds. It basically has the same effect as a group chat.
Make an If-Then Plan
Saying “I’ll study more” is a wish, and wishes are weak. Psychologist Peter Gollwitzer studied what he calls implementation intentions: plans in the form “If situation X happens, then I will do Y.” Across dozens of studies, people who made such plans were noticeably more likely to follow through than people who only set the goal. The reason seems to be that the plan links an exact trigger, like “when I sit down at my desk”, to an exact action, so you do not have to decide anything in the moment. Your brain notices the trigger more easily and starts the action almost automatically. It works best when the trigger is concrete and the action is small.
Try it today Pick one thing you keep postponing and write one sentence: “If it is [time or place], then I will [tiny action].” For example: “If I close my laptop after school, then I will put out my notes for tomorrow.”
Spotlight
Tu Youyou
The Chinese scientist led a secret malaria project that began on 23.05.1967. She noticed that a 1,700-year-old text recommended qinghao (sweet wormwood) and realized that hot water was destroying the active ingredient, so she switched to a low-temperature extraction. She volunteered as one of the first people to test the extract and won the Nobel Prize in Physiology or Medicine in 2015. More →