Éclat for the smartest girl in the room
Today: the 1929 shape-and-sound puzzle that almost everyone on Earth answers the same way, burgundy and brown quietly becoming fall 2026’s new neutrals, why rain smells the way it does, a wombat that makes cubes, the Moon that is slowly leaving us, and the study-method that scored 63% against 20% — plus a French phrase for staying calm under fire and the case of the stolen mascot head.
The Big Idea · Psychology & Language
Which One Is “Bouba”? The Shape Test Nearly Everyone Answers the Same Way
Picture two shapes: one a spiky, jagged star, the other a soft, rounded blob. Now, one is called “bouba” and the other “kiki.” Which is which? Almost certainly you said the blob is bouba and the spiky one is kiki, and so did about 95% of people in the classic versions of this test. The idea goes back to 1929, when the psychologist Wolfgang Köhler asked people to match made-up words (“takete” and “maluma”) to shapes and saw the same pattern. In 2013, researchers found that even four-month-old babies, who can’t talk yet, look longer at pairings that match the pattern. In 2022, a big study across 25 languages, nine language families and 10 writing systems found the effect again, and it didn’t depend on the alphabet. The likely reason is that your brain links what a sound feels like in your mouth (kiki is sharp and clipped, bouba is round and open) with what a shape looks like. Researchers call this “sound symbolism.”
Philosophical Transactions of the Royal Society B (Cwiek et al.) · 2022
Why it's cool It suggests that words are not completely arbitrary labels, and that your brain is quietly running a shape-detector on sounds you’ve never heard before.
Read moreBurgundy and Brown Are Becoming the New Neutrals
For years, “neutral” meant black, navy, beige or grey: colors that go with everything and say nothing. For fall 2026, trend reports describe rich brown and burgundy being treated exactly like that: not as statement shades, but as the base of an outfit, the way you would normally wear black or camel. It works because both colors sit in the warm, deep range that suits many skin tones and sits comfortably next to denim, cream and grey. They also read as “expensive” because they look chosen rather than default. To wear it, start with one burgundy or chocolate piece (a bag, boots, or a knit) and pair it with what you already own, then try brown with burgundy together, which looks deliberate and not matchy.
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Read moreRain Smells Like That Because of a Fizz
That fresh, earthy smell before and after rain has a name: petrichor. A big part of it is geosmin, a compound made by soil bacteria, and humans can detect it at just 5–10 parts per trillion, which makes your nose absurdly sensitive to it. In 2015, MIT researchers filmed raindrops hitting 28 different surfaces with high-speed cameras. When a drop lands on something porous, it traps tiny air bubbles that shoot upward and burst, like champagne, releasing a fine mist of aerosols that carries the scent into the air. Light and moderate rain produced the most; heavy rain released far fewer.
Tell someone The smell of rain is basically the soil fizzing like champagne, and your nose can detect it at a few parts per trillion.
Wombats Make Cubes, and Scientists Worked Out How
Wombats are the only known animals to produce cube-shaped droppings, and they use them to mark territory, because cubes stay put instead of rolling away. In 2018, a team including mechanical engineer Patricia Yang at Georgia Tech studied how it happens. The cubes form in the last stretch of the intestine, where the walls have both stiffer and stretchier sections that contract at different speeds. That uneven squeeze shapes the corners. The answer was found by physics and engineering as much as by biology.
Tell someone Wombats make cubes on purpose-ish: their intestines have stiff and stretchy sections that sculpt corners, so the droppings don’t roll off the rocks they’re marking.
The Moon Is Slowly Leaving Us
The Moon is drifting away from Earth by about 3.8 centimeters a year, roughly the speed your fingernails grow. We know because Apollo astronauts left mirror-like reflectors on its surface starting in 1969, and observatories still bounce laser beams off them and time the return trip. The cause is ocean tides: Earth’s spinning pulls the tidal bulge slightly ahead of the Moon, which tugs the Moon forward into a higher orbit while Earth’s day gets very slightly longer. In millions of years the Moon will look too small to cover the Sun completely, so total solar eclipses will eventually stop.
Tell someone The Moon is moving away at about the speed your nails grow, and we know that because we’ve been bouncing lasers off mirrors left up there since 1969.
le sang-froid
sahn-FRWAH · masculine noun
Calm self-control under pressure; keeping a cool head when things go wrong.
« Quand le micro est tombé en panne, elle a gardé son sang-froid et a terminé son exposé sans le moindre tremblement. »
When the microphone broke, she kept her cool and finished her presentation without the slightest tremor.
Literally “cold blood,” and English borrowed it too. In French it is a compliment: people with sang-froid stay clear-headed while everyone else panics. Use it for the friend who handles a disaster calmly. It pairs well with “garder” (to keep) or “perdre” (to lose): “Ne perds pas ton sang-froid.”
The Case of the Missing Mascot Head
The foam head of the school’s lion mascot vanished from the gym storeroom an hour before the pep rally. Ms. Lin, the sports coach, narrowed it down to three students who had keys: Ava, Ben and Cleo. She is certain that only one of them took it and that they acted alone. She is also certain that exactly one of them told her the truth and that the other two lied. Ava said, “Ben took it.” Ben said, “Ava is lying.” Cleo said, “I didn’t take it.”
Who took the mascot head?
Reveal the answer
Cleo took it. Ava and Ben contradict each other, so exactly one of them is telling the truth, which means Cleo must be the liar. If Cleo’s “I didn’t take it” is false, she did. (Check: Ava lied, so Ben didn’t take it; Ben told the truth by saying Ava was lying; Cleo lied.)
Almost everyone on Earth agrees that “kiki” is spiky and “bouba” is round, which makes it the only thing the whole planet agrees on. Even my group chat can’t decide where to eat, and food doesn’t have sharp corners.
Wombats solved their problem of things rolling away by making their droppings cubic. I have been trying to solve the same problem with my pens and my motivation for years, and so far I’ve only invented the pencil case that nobody can find.
The Moon leaves us by 3.8 cm per year, which is about the same speed at which my group project makes progress.
Mix Up Your Practice: Why Shuffled Problems Beat Neat Ones
When you study, it feels efficient to do ten problems of the same type in a row, then move to the next type. Researchers call this “blocked” practice. The alternative is “interleaving”: mixing different types of problems together. In a 2007 study by Doug Rohrer and Kelli Taylor, students learned to find the volumes of four kinds of geometric solids. Blocked practice looked better during practice, but a week later the interleaved group scored 63% on the test while the blocked group scored 20%. The reason is that mixing forces your brain to work out which method a problem needs, which is the exact skill an exam tests. It feels harder and slower, but that “desirable difficulty” is what makes it stick.
Try it today Take your next homework set (maths, chemistry, or grammar) and shuffle it: do one question from each type in rotation instead of finishing one type before the next. Before each question, say out loud which method you’ll use and why.
Spotlight
Inge Lehmann
In 1936, the Danish seismologist Inge Lehmann realized that odd earthquake waves could only be explained if Earth’s core has a solid centre inside a liquid shell, and she discovered the inner core. She worked it out by hand, according to her cousin, on pieces of cardboard torn from oatmeal boxes, and kept doing science for decades after that. She lived to 104. More →