Éclat for the smartest girl in the room
Today: the Strasbourg dancing plague of 1518, where hundreds of people danced themselves to exhaustion and sometimes death, the chore coat quietly replacing the wool topcoat for fall 2026, a glass drop that survives a hammer to the head but explodes if you flick its tail, a fungus that turns ants into puppets without even touching their brains, the 90-year-old color test that still trips up almost everyone, an honest look at what science actually found when it tested astrology, a French phrase for feeling completely unstoppable — plus the case of the pep rally playlist that gave away exactly when a video was really filmed.
The Big Idea · History
The Town Where Hundreds of People Couldn’t Stop Dancing
On 14 July 1518, in the walled city of Strasbourg, a woman named Frau Troffea stepped into the street and began to dance — and simply didn’t stop. She danced through the day, into the night, and kept going for almost a week straight, arms flailing, feet bleeding, with no music playing and no explanation anyone could offer. Within a month, as many as 400 other residents had joined her, dancing uncontrollably through the summer heat until some collapsed from exhaustion, and city records suggest a number of them died of heart attacks or strokes brought on by the nonstop exertion. Baffled physicians decided the cure for “dancing fever” was more dancing, so the town council hired musicians and cleared out a guild hall, even a grain market, to give the afflicted room to dance it out of their system — which, predictably, only made the epidemic worse. Historians researching the outbreak centuries later, most thoroughly historian John Waller, found that 1518 had brought Strasbourg a brutal run of famine, disease, and religious upheaval, and that every other confirmed dancing plague in European history struck this same corner of the continent during similarly desperate stretches. The leading explanation today isn’t poison or curse but mass psychogenic illness — a stress response so severe it turns physical and spreads through a community the way panic or laughter can, through observation rather than infection. Nobody has ever fully proven exactly what tipped Strasbourg’s collective nervous system over the edge that July, which is part of why the case still shows up in medical history courses five centuries later.
John Waller — A Time to Dance, a Time to Die · 01.01.2008
Why it's cool A city full of ordinary, sane people danced themselves into exhaustion and sometimes death without anyone drugging or forcing them — solid proof that psychological stress can become a genuine physical epidemic, not just a feeling.
Read moreThe Chore Coat Is Fall 2026’s Off-Duty Uniform
For the last few years, a heavy wool topcoat has been the default answer to “what do I put over everything else,” but fall 2026 runways and heritage labels alike are reaching for something rougher instead: the chore coat, the boxy, four-pocket cotton jacket originally cut for French railway and factory workers over a century ago. Brands from Levi’s to smaller workwear labels like Taylor Stitch and Universal Works have leaned into it this season, several finishing the collar and cuffs in corduroy even when the rest of the coat is denim or twill. Corduroy itself is having a wider moment beyond just coats, showing up in trousers, overshirts, and even full suits as a texture-forward alternative to plain denim. Part of the appeal is practical: a chore coat is boxy enough to layer over a hoodie or thick sweater without a fight for space, and worn-in cotton or corduroy only looks better with age instead of needing to be babied like a dressier coat. The easiest way in: one chore coat, worn open over something simple, does more for an outfit than an entire matching set.
Who What Wear
Read moreThe Glass Blob That Survives a Hammer but Explodes From a Flick
Drop molten glass into cold water and you get a strange, tadpole-shaped object called a Prince Rupert’s drop, named for the 17th-century prince who brought some to England as a curiosity. Its bulbous head can take a direct hit from a hammer and barely show a scratch, because the outside cooled and hardened first, locking the surface into a state of extreme compression — measured in 2017 at up to 700 megapascals, nearly 7,000 times normal air pressure. Snap off even a tiny piece of its thin glass tail, though, and the whole drop disintegrates in a fraction of a second, because that one crack finally has a path into the tense, stretched glass hiding at the drop’s core. High-speed cameras have clocked the resulting crack racing through the glass at over 3,000 miles per hour, splitting the whole drop into dust almost too fast to see.
Tell someone There’s a glass object, a Prince Rupert’s drop, that survives a direct hammer blow to its head but explodes into dust the instant you crack its thin tail — scientists only fully explained why in 2017.
The Fungus That Turns Ants Into Puppets
Ophiocordyceps unilateralis, the fungus behind the real “zombie ant” phenomenon, infects a carpenter ant, grows through its body, and eventually forces it to climb to a very specific height and clamp its jaws onto a leaf vein in a death grip, right before killing it and sprouting a spore stalk out of its head. For years scientists assumed the fungus was taking over the ant’s brain directly, but a study from Penn State and Notre Dame found something stranger: the fungal cells actually surround the brain without invading it, hijacking the ant’s own muscles instead, like a puppeteer pulling strings from outside the body. The fungus is precise about it, too — infected ants consistently bite down around solar noon and at a very specific height above the forest floor, exactly the light and humidity conditions the fungus needs to spread its spores afterward. It’s one of the clearest examples in nature of one organism completely overriding another’s behavior for its own reproductive benefit.
Tell someone There’s a real fungus, Ophiocordyceps unilateralis, that turns carpenter ants into puppets — it doesn’t even take over their brain, it controls their muscles from the outside like strings, forcing them to bite down at almost exactly noon before it kills them.
The 90-Year-Old Test Where Your Own Brain Trips You Up
In 1935, psychologist John Ridley Stroop ran a simple but sneaky experiment: he showed people the names of colors printed in ink that didn’t match — the word “red” printed in blue ink, for example — and asked them to say the ink color out loud, not read the word. People took noticeably longer and made far more mistakes than when the word and the ink color matched, or when they were just naming plain colored squares. The delay happens because reading is so automatic after years of practice that your brain reads the word almost against your will, and that reflex fights directly with the separate task of naming the color, creating a split-second traffic jam. Psychologists still use the Stroop test today, nearly a century later, as a quick, reliable way to measure how well someone’s brain can override an automatic response in favor of a conflicting instruction.
Tell someone There’s a 90-year-old psychology test, the Stroop effect, that trips up almost everyone: try saying the ink color of the word “blue” typed in red letters out loud, not reading the word — your own reading reflex will fight you the whole way.
Are You Really a Scorpio? What the Science Says About Zodiac Signs
Astrology sorts everyone into one of twelve zodiac signs based on birth month, each one supposedly carrying its own set of personality traits, from a bold Aries to a dreamy Pisces. In 1985, physicist Shawn Carlson ran the most famous scientific test of the idea: 28 respected astrologers were given real birth charts along with three real personality profiles — one belonging to the actual person and two random ones — and simply asked to pick which profile matched which chart. Published in the journal Nature, the astrologers picked correctly at almost exactly the rate you’d expect from random guessing, even though they’d agreed in advance that this was a fair test of their own skill. A few astrology researchers have since pushed back on how the results were analyzed, but no large, well-designed study since has found reliable evidence that birth month predicts personality any better than chance. That doesn’t make your sign’s description feel any less accurate when you read it — it just means that feeling likely says more about how broadly the descriptions are written than about the actual date on your birth certificate.
Fine print The best-known scientific test of astrology found zodiac signs predicted personality no better than random chance — the eerie feeling that your sign is “so you” is worth enjoying without treating it as evidence.
avoir la pêche
ah-vwahr lah pesh · idiom (verb phrase)
Literally “to have the peach” — to feel great, energized, and ready to take on the day, the French equivalent of being totally pumped.
« Je ne sais pas pourquoi, mais ce matin j’ai la pêche ! »
I don’t know why, but I’m full of energy this morning!
Nobody’s fully certain why French picked a peach specifically to mean feeling great — one popular theory ties it to old slang where a round, healthy-looking face meant someone looked, and felt, terrific, alongside cousin phrases like “avoir la frite” (to have the fry) and “avoir la banane” (to have the banana, meaning to have a big smile). Whichever fruit or food you pick, the grammar is the same: instead of just saying you feel good, French makes you claim to actually possess the good feeling, like it’s something you’re holding in your hand.
The Case of the Playlist That Started Too Soon
The AV club’s wireless microphone disappeared from the sound booth sometime during Friday’s hour-long pep rally, held in the gym from 3:00 to 4:00pm. The club had queued the exact same four-song hype playlist all football season, always in the same order and always the same length: “Song One” from 3:00–3:15, “Song Two” from 3:15–3:30, “Song Three” from 3:30–3:45, and “Song Four” closing out the rally from 3:45–4:00, with the gym’s speakers loud enough to identify whichever song was playing from anywhere on the floor, the hallway outside, or the concession stand by the side doors. Every AV club member could name, without checking a phone, exactly which of the four songs had been playing at any given moment that afternoon — it was the whole reason nobody in the club ever needed a watch during a rally. The sound booth sits directly behind the concession stand, just a few steps past the side doors. When club treasurer Marcus was asked to account for the 3:20-to-3:40 stretch when the microphone vanished, he said he’d never left the concession stand, where he was helping restock cups the entire time, and offered proof: a video he’d filmed there for the school’s social media account, timestamped 3:40, with the concession line and the rally clearly audible behind him.
What does the song playing in the background of Marcus’s video actually reveal about when he really filmed it?
Reveal the answer
Marcus’s video captures “Song Two” playing clearly in the background — but Song Two only ever airs from 3:15 to 3:30, a full ten minutes before his claimed 3:40 timestamp, and by then “Song Three” should have been playing instead, exactly as it was for everyone else on the gym floor that afternoon. That means the video was actually filmed sometime before 3:30, not at 3:40, leaving Marcus’s whereabouts for a real chunk of the missing-microphone window — including the few steps from the concession stand to the sound booth just behind it — completely unaccounted for.
In 1518, hundreds of people in Strasbourg danced uncontrollably for weeks straight, some literally dancing themselves to death, and the town’s official solution was to hire more musicians. My gym teacher’s solution to literally any activity going sideways has always run on that exact same instinct: more energy, never less.
A Prince Rupert’s drop can survive a direct hit from a hammer to the head but explodes into dust if you so much as flick its tail. Extremely relatable to how I can handle an entire week of finals just fine and then completely fall apart because someone borrowed my favorite pen without asking.
In 1935, a psychologist proved that people slow down and make mistakes when a color word is printed in the wrong color ink, because reading is basically an involuntary reflex by that point. Fully explains why I cannot, under any circumstances, walk past a typo in a group chat without silently fixing it in my head first.
Talk to Yourself Like You’re Talking to a Friend — Literally, By Name
In 2014, University of Michigan psychologist Ethan Kross ran people through genuinely stressful tasks — an unprepared speech in front of judges, a stretch of time spent believing they were about to be evaluated — and had half of them coach themselves through it using “I,” and the other half coach themselves using their own name and “you,” the way a friend would talk to them. The people using their own name reported feeling calmer, and independent observers watching the footage rated their actual performance as noticeably better, even though nothing about the situation itself had changed. Kross calls the trick self-distancing: swapping “I” for your own name creates just enough psychological space to see a stressful moment as a challenge you can handle instead of a threat closing in on you — the same shift that lets you give a friend calm, clear advice you’d never manage to give yourself in the first person. The effect has now shown up across dozens of follow-up studies, from public speaking to processing a bad breakup, and it costs nothing and takes zero practice to try.
Try it today Right before your next nerve-wracking moment, coach yourself through it silently using your own name instead of “I” — “[Your name], you’ve got this, just take it one point at a time” — the same way you’d talk a friend through it.
Spotlight
Marie Tharp
In the 1950s, geologist Marie Tharp spent years hand-drawing the first detailed map of the Atlantic Ocean floor from sonar data, since women weren’t allowed on the research ships that collected it. When she spotted a deep valley running down the center of her map and suggested it was evidence continents were drifting apart, her research partner initially dismissed the idea as “girl talk” — she turned out to be right, and her map became key evidence for plate tectonics, one of the most important ideas in modern geology. More →