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Hello, curious minds!
Earth Day is just four days away — and this year, we thought we'd mark it not with big gestures, but with quiet wonder. Because some of the most extraordinary things happening on our planet are happening silently, invisibly, and right beneath our feet.
This week, we're tuning in to what the natural world has been quietly saying. We're also heading to outer space — in a wooden box. And somewhere in the middle, we're marvelling at a word that needs no translation: the sound of pure laughter.
Weekly Word Wonder: MIRTH
Pronunciation: MIRTH (rhymes with earth)
Part of speech: Noun
Definition: Great merriment and laughter; joyful amusement — the kind that fills a room, warms a table, and travels through walls
Origin: From Old English myrhþ (joy, pleasure), from Proto-Germanic murgijaz — the very same ancient root that gives us the word merry. So when you hear "Merry Christmas," you're hearing a quiet echo of mirth itself.
First recorded in English: Before the 12th century — one of the oldest joy words in the language.
Usage:
"The children's mirth echoed down the hallway long after the birthday candles had been blown out."
"A single look between old friends was enough to dissolve into helpless mirth — no explanation needed."
Curiosity Corner:
Plants Scream — You Just Can't Hear It
When a tomato plant runs out of water, it makes a sound. You can't hear it — but a moth can.
In March 2023, researchers at Tel Aviv University published a study in the journal Cell revealing that plants emit ultrasonic clicks — sounds in the 20 to 100 kilohertz range — when they are under stress. The team recorded these sounds from tomato and tobacco plants using microphones placed nearby (not touching), and the results were striking:
Drought-stressed plants emitted an average of 35 clicks per hour
Cut plants emitted around 25 clicks per hour
Undisturbed, well-watered plants were nearly silent
The sounds varied depending on the type of stress — meaning the plants were, in effect, broadcasting different signals for different problems. Insects, bats, and other animals capable of detecting ultrasonic frequencies could theoretically respond. Some moths already do: they avoid laying eggs on plants that are broadcasting stress.
We assumed plants were silent because we couldn't hear them. This Earth Day (April 22), here's a thought worth sitting with: they've been making noise the whole time. We just hadn't listened at the right frequency.
Did You Know?
The Wooden Satellite
In 2024, JAXA (Japan's space agency) and Kyoto University launched LignoSat — the world's first wooden satellite — from the International Space Station. Built from magnolia wood, it was designed to test whether timber can survive the harsh conditions of orbit (it can — without warping, cracking, or off-gassing chemicals). The real genius? When LignoSat eventually re-enters Earth's atmosphere, it will burn up completely, leaving no metal debris behind. A tiny wooden box, orbiting Earth, quietly solving a space junk problem that no one else thought to tackle with carpentry.
🐾 The Indestructible Animal
Meet the tardigrade — a microscopic, eight-legged creature also known as a "water bear," roughly 0.5mm long and almost impossible to kill. The European Space Agency confirmed through real spaceflight experiments that tardigrades can survive the vacuum of outer space, temperatures ranging from -272°C to 150°C, radiation doses more than 1,000 times the human lethal level, and decades of complete dehydration — only to be rehydrated back to life. They are found on every continent including Antarctica, in ocean trenches, and in mountain tops. Evolution's most quietly astonishing achievement.
🎨 The Colour That Doesn't Exist
In 2023, researchers at UC Berkeley built a device called "Oz" — using precisely targeted laser pulses to stimulate individual cone cells in the human eye. When they activated M-cones (responsible for green perception) in complete isolation — something that never happens naturally — participants experienced a colour they had never seen before. They named it "olo": a deeply saturated teal-blue that participants described as unlike anything visible in the real world. Published in Science Advances, the study suggests that the range of colours humans can see is not a fixed biological limit — it's simply the range we've had access to so far.
Community Puzzle: Cryptic Clues
Three nature-themed cryptic clues this week — can you crack all three? Post your answers in the comments!
"Fungi's tiny traveller — scramble ROPES to find it (5)"
"A climbing plant quietly hiding inside 'divine energy' (4)"
"A velvety green plant, hiding inside 'cosmos stars' (4)"
(Scroll down for last week's answers!)
Last Week's Answers (Edition #21 — Cryptic Clues)
"Incompetent stargazer's cloud? Rearrange the evidence! (6)" NEBULA
"Polar light display: Latin gold precedes a prayer (6)" AURORA
"Astronomical turning point: COIL SETS all in a muddle (8)" SOLSTICE
Happy Earth Day, Lexulous community — see you next week.
— The Lexulous Team
