Tag
Sound
Noise, music, echoes, and hearing — 44 tiny stories across 7 shelves.
Everyday wonders
Kitchen, bubbles, echoes, and odd little magic — 11 stories.
All everyday wonders →Your body is already predicting
Why Is It Hard to Sit Still to Music?
Muscles answer about a fifth of a second late, so clapping on the beat means deciding before it arrives. A crowd syncs without arranging anything.
Let’s go →A skin that shoves the air
How Does a Drum Make a Sound?
A string's wobbles line up into a note; a round skin's do not, so a drum reads as a hit. The middle thuds, the edge rings and the rim gives a crack.
Let’s go →Sound coming back
What Is an Echo?
An echo is sound bouncing off a surface and reaching you a second time, late enough — over about a tenth of a second — to be heard as separate.
Let’s go →Far, hard and facing you
Why Do Canyons Echo So Well?
A wall has to be at least 17 metres off before you hear its echo separately. Bare rock reflects nearly all the sound where a forest would swallow it.
Let’s go →Nothing left to absorb sound
Why Are Empty Rooms So Echoey?
Furniture and curtains swallow sound. Strip a room bare and every reflection keeps bouncing, smearing speech into the mush you hear in an empty flat.
Let’s go →Thickness, tightness, length
Why Do Guitar Strings Sound Different?
Only three things about a string decide the note it makes — how thick it is, how tight, and how long — and a guitar lets you change all three.
Let’s go →Faster sound, same vibration
Why Does Helium Make Your Voice Squeaky?
Sound travels far faster in helium, so the resonances of your unchanged throat leap upward. Your vocal cords carry on buzzing at exactly the same pitch.
Let’s go →A muscle misfiring
What Causes Hiccups?
An irritated nerve jerks the diaphragm into an unplanned gulp, and about 35 milliseconds later the vocal cords snap shut on it. That snap is the sound.
Let’s go →Eighty-eight little catapults
What Happens Inside a Piano?
A piano key does not push the hammer onto the string. It throws the hammer and lets go in mid-air, so the note is free to ring afterwards.
Let’s go →Notes that share their wobbles
Why Does Singing Together Sound Good?
Two notes slightly apart make a throbbing that singers use to tune themselves, and a choir drifts into agreement until even the breathing lines up.
Let’s go →The same note, a different mix
Why Does a Piano Not Sound Like a Violin?
A flute and a violin can play exactly the same note and never be confused, because each adds its own mix of quieter higher notes above it.
Let’s go →Animals
Creatures on land, in the sea, and in the air — 10 stories.
All animals →Shouting at the world and listening back
How Does a Bat See in the Dark?
A bat crosses a pitch-black cave by shouting too high for you to hear and timing the echoes — and its wings are hands with enormous fingers.
Let’s go →A comb and a scraper
How Does a Cricket Chirp?
A cricket does not chirp with its mouth. It scrapes a hard wing edge over a comb of ridges, and listens with eardrums in its front legs.
Let’s go →A picture built from echoes
How Do Dolphins See With Sound?
A hollow ball and a solid one ring differently, so a dolphin hears what a thing is made of and not merely where it is — hundreds of times a second.
Let’s go →Shout, listen, measure
How Do You See With Sound?
Echolocation is measuring distance by timing an echo — and bats, dolphins, ships and hospital scanners all do the same arithmetic.
Let’s go →A nose with forty thousand muscles
What Can an Elephant Do With Its Trunk?
An elephant's trunk is a boneless nose and upper lip with tens of thousands of muscles, used to breathe, drink, grab, smell and talk.
Let’s go →Catching what you cannot see
How Does a Fox Hunt Under Snow?
A fox catches a mouse it never sees by comparing what each ear hears, tilting until it has the depth, then diving head-first at the sound.
Let’s go →An argument without a fight
Why Does a Gorilla Beat Its Chest?
Chest-beating is an honest advertisement of size, carried far enough that a rival can decide to back down long before anybody has to get hurt.
Let’s go →Hearing in three dimensions
How Do Owls Hunt in the Dark?
An owl's ears sit at deliberately different heights, so a sound reaches one a fraction before the other. That gap is enough to locate a mouse in the dark.
Let’s go →No lips, no teeth, no vocal cords
How Does a Parrot Talk?
A bird's voice box sits at the fork of its windpipe, so each branch works separately and some birds hold two notes at once — a duet with themselves.
Let’s go →Radiators that also listen
Why Do Rabbits Have Such Big Ears?
Related animals in hot places grow bigger ears, legs and noses the world over — a desert jackrabbit's run to about a quarter of its own body length.
Let’s go →Physics
Invisible forces you can play with — 8 stories.
All physics →Waves bunched and stretched
Why Does a Siren Change Pitch as It Passes?
To the driver the siren never changes at all. Light does the same thing, which is how a receding galaxy shifts red and betrays an expanding universe.
Let’s go →How big the push is
What Makes a Sound Loud?
Loudness is how hard the air gets shoved; pitch is how often. The two are entirely independent, which is why a whisper and a shout can hit the same note.
Let’s go →Counting wiggles
What Makes a Sound High or Low?
Fast vibrations sound high and slow ones sound low. That is the whole of pitch — a count of wiggles per second, and nothing more complicated.
Let’s go →Pushing in time
Why Does One Note Rattle the Window?
Every object has a rhythm it swings at naturally. A sound matching that rhythm adds a push on every swing, so tiny pushes build into a rattle.
Let’s go →Air, pushed
How Does Sound Travel?
Sound is not a thing that flies. It is a squeeze handed from one air molecule to the next, passed all the way along to your eardrum.
Let’s go →Fifteen times faster through steel
Sound Goes Faster Through a Wall Than Through Air
Sound travels by particles shoving their neighbours, so the stiffer the material the faster the shove passes — steel beats water, and water beats air.
Let’s go →Squeeze and stretch
What Does a Sound Wave Look Like?
Each patch of air only shuffles back and forth a fraction of a millimetre, passing the squeeze along at 343 metres a second. Nothing travels with it.
Let’s go →Wobbling back to the middle
Why Do Things Vibrate?
Push something springy out of shape and it overshoots the middle coming back, then overshoots again. Match its natural rate and the swing keeps growing.
Let’s go →How things work
Everyday machines, taken apart — 6 stories.
All how things work →A circuit that completes itself
What Happens When You Press a Doorbell?
The button is not the bell. It is a gap in a circuit your finger closes, letting current turn a coil into a magnet that swings a hammer.
Let’s go →Adding a wave to its own mirror
Why Does Noise-Cancelling Work?
A predictable engine drone can be anticipated and cancelled, but clattering cutlery is different every time and mostly gets through regardless.
Let’s go →A speaker running backwards
How Does Your Voice Get Recorded?
A membrane thinner than paper flexes when your voice hits it, and that movement is measured thousands of times a second into a list of numbers.
Let’s go →A wobble carried on a wave
How Does Music Get Into a Radio?
A station sends out one steady wave and wobbles it in time with the sound; your radio picks that wave alone and reads the wobble back off.
Let’s go →A magnet shoving paper
How Does a Speaker Make Sound?
A coil carrying the recorded current becomes a magnet, dragging a paper cone in and out so it shoves the air at exactly that rhythm.
Let’s go →Sound turned into electricity and back
How Does a Voice Travel Down a Wire?
A telephone turns the air's vibration into a matching electrical wobble, sends that down a wire, and turns it back into sound.
Let’s go →Life & body
Seeds, hearts, senses, and growing things — 5 stories.
All life & body →A sudden gale, from inside
Why Do You Cough?
A cough is a pressure explosion: seal the airway, squeeze hard, then let go all at once, fast enough to scrape the whole tube clear.
Let’s go →Vibration turned into signals
How Do You Hear?
Sound shakes your eardrum, three tiny bones amplify the motion, and a coiled tube sorts it by pitch before hair cells turn it all into nerve signals.
Let’s go →An empty tube, squeezing anyway
Why Does Your Stomach Rumble?
Your stomach does not stop working when it is empty. It sweeps itself out, loudly, and hunger itself is a hormone that peaks on a schedule.
Let’s go →An alarm, not a measurement
Why Does It Hurt?
Pain is not damage arriving at your brain but your brain deciding an alarm is worth sounding — which is why a paper cut can scream at you.
Let’s go →Two flaps, flapping very fast
How Do You Make Your Voice?
Whisper and the folds never touch — it is only rushing air, shaped the same way, which is why a whisper is still perfectly understandable.
Let’s go →Earth & sky
Weather, light, and the air around us — 3 stories.
All earth & sky →Nobody has been below 12 km
How We Know What Is Inside the Earth
Earthquake waves travel through the planet, and one kind of wave never comes out the far side — which is how we know the core is liquid.
Let’s go →Counting between flash and bang
How Far Away Is the Storm?
Lightning and thunder leave together, but light arrives instantly and sound takes three seconds a kilometre. Count the gap and divide by three.
Let’s go →Air exploding
Why Does Thunder Rumble?
Lightning heats air so fast that it explodes outward. Thunder is that bang, and the rumble is one long bolt arriving in stages, nearest end first.
Let’s go →Space
Crashy night-sky stories — 1 story.
All space →