Tag
Food & kitchen
Cooking, baking, and what happens on the plate — 99 tiny stories across 7 shelves.
What things are made of
Atoms, metal, glass, plastic, and every kind of stuff — 37 stories.
All what things are made of →Sour, and eager to give something away
What Makes Something an Acid?
An alkali soaks those particles up instead, so the two cancel to salty water and heat — and your stomach survives its own acid on renewed slime.
Let’s go →A fruit with no seeds and no parents
Why Are Bananas All the Same?
Every banana in the shop is a cutting from one plant, which is why they are identical, seedless, cheap and defenceless against disease.
Let’s go →A sugar you cannot digest, but bacteria can
Why Do Beans Make You Windy?
Beans carry a sugar humans have no enzyme for, so it reaches the large intestine intact and the bacteria living there ferment it, giving off gas.
Let’s go →Where roast smells come from
Why Does Food Turn Brown When It Cooks?
Above about 140 degrees, sugars and proteins start reacting with each other and build hundreds of colour and flavour molecules that were not there before.
Let’s go →Shaking a mixture until it gives up
How Does Cream Turn Into Butter?
Cream is fat droplets floating in water, each in a protective coat. Churning smashes those coats off so the fat clumps and the watery part drains away.
Let’s go →A colour that was chosen
Why Are Carrots Orange?
Wild carrots are pale and thin. The orange root is a few centuries old, bred deliberately for the pigment it packs away underground.
Let’s go →Splitting a liquid into two
How Does Milk Become Cheese?
Cheese-making starts by splitting milk into solid curds and watery whey, throwing most of the whey away, then pressing, salting and ageing what is left.
Let’s go →A few weeks, and then nothing
Why Do Cherries All Ripen at Once?
A cherry tree flowers all at once, so the entire crop ripens in about three weeks — a violent little season, and why cherries cost so much.
Let’s go →Rot it, roast it, grind it
How Does a Bitter Bean Become Chocolate?
A raw cocoa bean tastes horrible. Chocolate exists because somebody let the beans ferment first, then dried, roasted and ground them.
Let’s go →Most of it is smell
Why Does Coffee Smell Better Than It Tastes?
Coffee's appeal is almost entirely aroma, because the tongue only reports bitter and sour and the nose reports hundreds of things.
Let’s go →Almost entirely water, on purpose
Why Is a Cucumber So Watery?
A cucumber is about ninety-six parts water in a hundred, held under pressure in a scaffold of cells — hence crisp, cool and quickly limp.
Let’s go →A narrow window of heat
Why Does Custard Suddenly Scramble?
Egg proteins unfold and tangle to thicken a custard over a few degrees, then clump and squeeze the liquid out over the next few. The margin is very thin.
Let’s go →Letting something rot on purpose
What Is Fermenting?
Fermenting means letting chosen microbes eat sugar, which changes the food and makes it hostile to anything that would spoil it.
Let’s go →Oil goes far hotter than water
Why Does Frying Taste Different From Boiling?
Water stops dead at 100 degrees, so boiling can only soften. Oil sails on to 180, and that is where browning, crisping and most of the flavour happen.
Let’s go →Take the water out and it keeps
Why Do Grapes Turn into Raisins?
A grape rots in days and a raisin keeps for years, and the only difference between them is the water that microbes needed and no longer have.
Let’s go →Three thousand years, unspoiled
Honey Found in a Tomb Is Still Honey
Honey does not spoil, because three defences work at once — almost no free water, unexpected acidity, and an enzyme the bees add that makes peroxide.
Let’s go →A mesh built from fruit
Why Does Jam Set?
Long pectin chains from the fruit link into an invisible mesh once acid and sugar allow it, and the sugary liquid is held still inside it.
Let’s go →It was never dissolved
Why Does Juice Separate in the Glass?
Juice is not one liquid. The cloudiness is solid fruit floating rather than dissolved, and floating things get sorted by weight once the glass goes still.
Let’s go →Mostly a surface job
What Does a Marinade Actually Do?
A marinade barely gets in. Salt travels, acid tenderises the surface and then toughens it, and oil carries the flavours that water cannot dissolve.
Let’s go →A sensor told a lie
Why Does Mint Feel Cold?
Mint cools nothing at all. Menthol holds your cold sensor open, so the nerve reports cold while the thermometer never moves. Chilli does the same trick.
Let’s go →A coat of tiny hairs
Why Is a Peach Fuzzy?
Each hair grows out of the skin the way hair grows out of yours, and the smooth version pays for it — a nectarine bruises sooner and dries faster.
Let’s go →A fruit that ripens from the inside
Why Do Pears Go from Hard to Mushy So Fast?
A pear ripens from its core outward, so the outside only feels ready once the middle has already turned — which is why it has one good day.
Let’s go →A chemical that lies to your nerves
Why Are Some Peppers Hot?
A chilli is not actually hot. It carries a chemical that opens the nerve reporting high temperature, so the burn is a signal about nothing.
Let’s go →Making the jar uninhabitable
Why Does Pickling Stop Food Rotting?
Microbes need water and a comfortable acidity to spoil food. A pickle jar removes both at once, then seals the lid so no new ones can get in.
Let’s go →A fruit that eats you back
Why Does a Pineapple Sting Your Mouth?
The enzyme that tingles is the one that tenderises steak and stops a jelly setting — and every diamond on the skin was once its own flower.
Let’s go →Starch drinking the water
Why Does Porridge Go Thick?
Oats and water go into the pan as two things and leave as one, because heated starch grains swell, burst and tangle into a water-holding mesh.
Let’s go →A stem pretending to be a root
Why Do Potatoes Go Green?
A potato is not a root but a swollen underground stem, so light turns it green and triggers the bitter defence that comes with the colour.
Let’s go →A rock you are allowed to eat
Where Does Salt Come From?
Salt is the one rock people put on their food — left behind wherever seawater dries out, in pans today or in beds buried by seas long gone.
Let’s go →The same temperature, treated gently
Why Do Cooks Simmer Instead of Boil?
A rolling boil is not one degree hotter than a gentle simmer. All the extra violence buys is faster evaporation and food knocked to pieces.
Let’s go →Cooking without soaking
Why Does Steaming Keep the Flavour In?
Boiled food loses its flavour and vitamins into the water. Steam cooks at the same temperature but gives them no water to dissolve into.
Let’s go →Turning tough into silky
Why Do Cooks Boil Bones for Hours?
Hours of gentle heat unwind the toughest tissue in an animal into gelatine, which is what gives stock its body. A hard boil only makes it cloudy.
Let’s go →A shape that fits a lock
Why Is Sugar Sweet?
Sugar tastes sweet only because its shape happens to fit a receptor on your tongue — and it is the fuel nearly every living thing runs on.
Let’s go →A skin you cannot digest
Why Does Sweetcorn Come Out Whole?
Each kernel is wrapped in cellulose, which no human enzyme can cut, so the wrapper survives the journey while the inside is absorbed.
Let’s go →One plant, four drinks
Why Is Tea Different Colours?
Green, black, white and oolong all come off the same bush, separated only by how long the leaf was left to brown before it was dried.
Let’s go →Both, depending on who is asking
Is a Tomato a Fruit or a Vegetable?
An 1893 tax case sent the question to the American Supreme Court. Below twelve degrees a tomato stops making its smell, so a fridge really does ruin it.
Let’s go →Cold, sweet and mostly water
Why Is Watermelon So Refreshing?
Watermelon is over nine-tenths water with sugar and salts in it, which is close to what a body actually needs after sweating.
Let’s go →Bacteria doing the thickening
How Does Milk Become Yoghurt?
Bacteria eat the sugar in milk and make acid, and the acid makes the milk proteins link up into the soft set. Nothing is added but the bacteria and time.
Let’s go →Everyday wonders
Kitchen, bubbles, echoes, and odd little magic — 23 stories.
All everyday wonders →Fruit rusting
Why Does a Cut Apple Turn Brown?
Cutting an apple lets an enzyme that was safely stored meet the oxygen in the air, and together they build a brown pigment over the exposed surface.
Let’s go →A gas being made
Why Does Baking Soda Fizz?
Baking soda meets an acid and the two swap parts to make carbon dioxide. The fizz is a brand-new gas taking up far more room than the ingredients did.
Let’s go →Water turning to gas inside itself
What Are the Bubbles When Water Boils?
The bubbles are water itself, turned to vapour deep in the pan rather than air escaping. Once it boils the temperature stops rising, however high the heat.
Let’s go →A wire crossed
Why Does Ice Cream Give You a Headache?
Press your tongue flat against the roof of your mouth and it stops. The nerve rarely hears from the palate, so it blames the forehead instead.
Let’s go →A fungus breathing out
Why Does Bread Rise?
Yeast is alive: it eats the sugar in the dough and breathes out carbon dioxide, and a stretchy gluten net catches the gas instead of letting it escape.
Let’s go →Kind to the blade, unkind to germs
Why Are Chopping Boards Made of Wood?
Wood is soft enough to spare a knife edge and wicks moisture away from bacteria. Keeping separate boards, though, matters far more than the material does.
Let’s go →A grain that drinks
Why Does Rice Need Exactly the Right Water?
Rice does not boil soft. Each grain absorbs a fixed amount of water and then stops, which is why the measure matters far more than the time does.
Let’s go →Broken up, not vanished
Where Does Sugar Go in Water?
The sugar is all still there — the water weighs exactly that much more. It disappears because a single molecule is smaller than a wavelength of light.
Let’s go →Two points beat one
Why Does a Fork Have Prongs?
A fork does not cut, it holds — and one point lets food spin away. A second locks it still, and the rest share the push so nothing tears.
Let’s go →Ice leaving without melting
What Is Freezer Burn?
Ice can leave your food without ever melting, turning straight to vapour and refreezing on the packet. Months of that leaves the food dry and stale.
Let’s go →Smell molecules escaping
Why Does a Fridge Smell of Everything at Once?
Every food quietly gives off molecules, and a sealed cold box gives them nowhere to go. Fatty foods then soak them up and hold on to them.
Let’s go →Heat always moving in
Why Does Ice Cream Melt?
Heat always flows from warmer to colder and never the other way, so a warm room melts ice cream — and melting takes a surprising amount of energy.
Let’s go →A fungus, eating your lunch
What Is the Fluff on Old Bread?
The fluff is only the visible half. Invisible threads are digesting the bread from inside while the stalks above launch spores towards the next loaf.
Let’s go →A chemical booby trap
Why Does Chopping Onions Make You Cry?
The gas is a bulb's defence against animals that dig, and we are collateral damage. A chilled onion and a sharp blade both release far less of it.
Let’s go →Cloudy water is useful water
Why Do Cooks Save the Pasta Water?
The cloudiness is starch, and starch does three jobs at once: it thickens the sauce, holds oil and water together, and makes the whole thing cling.
Let’s go →Steam bursting out
Why Does Popcorn Pop?
A kernel is a waterproof shell with water sealed inside. Heat turns that water to high-pressure steam until the shell can no longer hold it in.
Let’s go →Stopping the heat walking out
Why Does a Lid Make Water Boil Faster?
Most of the heat leaving an open pan walks out as steam. A lid sends it back, so almost everything the hob supplies goes into the water instead.
Let’s go →Making water boil hotter
How Does a Pressure Cooker Cook Faster?
Trapping the steam raises the pressure, and higher pressure pushes water's boiling point up to about 120 degrees. Hotter water simply cooks faster.
Let’s go →All the force in one line
Why Is a Sharp Knife Safer Than a Blunt One?
A sharp edge is a few hundred atoms across, so almost any push cuts. A blunt one makes you lean on it, and a skid sends that stored force somewhere else.
Let’s go →Gas hiding in plain sight
Where Do the Bubbles in Fizzy Drinks Come From?
The gas was dissolved into the liquid under pressure. Opening the bottle releases it, and the surplus gathers on rough spots and rises as bubbles.
Let’s go →Metal and protein shaking hands
Why Does Food Stick to the Pan?
Food sticks because its proteins genuinely bond to hot metal. It lets go on its own once a dry crust has formed, or never bonds if oil keeps the two apart.
Let’s go →Sugars and proteins reacting
Why Does Toast Go Brown?
Toast is not just drying out. Heat drives sugars and proteins to react into new brown, aromatic compounds — the same reaction as searing a steak.
Let’s go →Proteins forced to unfold
How Does Egg White Turn Into Foam?
Whisking unfolds the proteins in egg white so they wrap every air bubble in a strong film. Beat too long and those proteins clump and the foam collapses.
Let’s go →Life & body
Seeds, hearts, senses, and growing things — 18 stories.
All life & body →A very fast crowd
Why Does a Pond Turn Green?
Sunlight is free, so stray fertiliser is what sets the limit — remove it and a handful becomes millions in a week, shading the pond floor dead.
Let’s go →Air that took a wrong turn
Where Does a Burp Come From?
Almost every burp is air you swallowed without noticing. Gas floats to the top of your stomach, and the way in is the only way out.
Let’s go →A heap that cooks itself
Why Does a Compost Heap Get Hot?
A heap has to reach about a cubic metre before its middle can hold heat, and once it does the warmth kills weed seeds and many plant diseases.
Let’s go →Four rings, one job
What Is a Flower Made Of?
A flower is built in rings, and the middle ring is the one that matters: once pollen arrives, that ovary swells into fruit and its eggs become seeds.
Let’s go →The food is the small part
What Gets Wasted When Food Is Thrown Away?
Throwing away a sandwich wastes the field, the water, the fuel and the year behind it — and about a third of all food grown is never eaten.
Let’s go →Living things too small to see
What Are Germs?
Thousands of bacteria fit across a full stop, and one doubling every twenty minutes becomes millions in a day. Feeling ill is largely your own response.
Let’s go →Growing from the wrong end
Why Doesn't Cutting Grass Kill It?
Almost every plant grows from its tips, which is why cutting hurts them. Grass grows from the base of each leaf, so mowing removes only the oldest part.
Let’s go →Roughly one bacterium per human cell
About Half of You Is Not You
Your body is roughly half bacteria by cell count, mostly living in your gut, and the famous ten-to-one version of that figure turned out to be wrong.
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 →Seven metres of grabbing
Why Are Your Intestines So Long?
Ridges multiply the area by three, villi by thirty and each cell's own fuzz by twenty again. The squeezing works upside down, so astronauts can eat.
Let’s go →The chemistry room
What Is a Liver For?
Take two-thirds of a liver away and the rest grows back within a couple of months. No other large organ in you will do anything of the kind.
Let’s go →The tip of something bigger
What Is a Mushroom?
The mushroom is only the fruit. The real organism is a hidden network of threads that digests its food outside itself and quietly recycles the forest.
Let’s go →A plant and its lunch
What Is Inside a Seed?
A seed is a whole dormant plant packed with its own food store inside a tough coat, waiting for water to arrive and switch it back on.
Let’s go →Catching actual molecules
How Does Smelling Work?
Around 400 receptor types, each waiting for a particular molecular shape, combine into trillions of smells — and into most of what you call taste.
Let’s go →Taken apart, then absorbed
What Happens to Food You Eat?
Nothing is absorbed until it is molecule-sized. Acid unravels proteins, but the real work happens in seven metres of small intestine folded very small.
Let’s go →Five basics, plus your nose
How Does Taste Work?
Your tongue detects only about five things. Everything else you call flavour is smell, arriving at your nose from the back of your own mouth.
Let’s go →A toolkit in your mouth
Why Do Teeth Have Different Shapes?
Chewing works by multiplying surface area, and three tooth shapes split the job: chisels at the front, cones for gripping, millstones at the back.
Let’s go →A judgement, not a species
What Makes a Plant a Weed?
Mint in a pot is a herb and mint in a border is a menace. Break a dandelion root and every piece regrows, which is why digging can spread it.
Let’s go →Animals
Creatures on land, in the sea, and in the air — 18 stories.
All animals →Chemical trails
How Do Ants Find Food?
Ants lay scent trails that evaporate steadily. A short route gets walked more often and so stays strongest, and the colony finds it with nobody in charge.
Let’s go →A tool for one job
Why Are Bird Beaks All Different Shapes?
A beak is a bird's only hand, mouth and tool, so its shape is a direct record of one food — pliers for seeds, a straw for nectar.
Let’s go →A deal, not a favour
Why Do Bees Visit Flowers?
A flower makes nectar purely to give it away, and the bee carries pollen entirely by accident, on hairs that are branched and slightly charged.
Let’s go →Teeth in the wrong place
Why Do Chickens Swallow Stones?
A chicken has no teeth at all. It swallows small stones on purpose and grinds its food against them in a muscular gizzard further down.
Let’s go →A stomach with four rooms
Why Does a Cow Chew All Day?
Grass is nearly indigestible, so a cow ferments it with microbes in a huge first stomach, brings it back up, and chews the same mouthful twice.
Let’s go →You are what you eat
Why Are Flamingos Pink?
The pink is not theirs. Pigment from the algae and shrimp they eat is carried into each feather as it grows, so the colour is eaten first.
Let’s go →Two ways to rent a stomach
Why Do Grass-Eaters Have Such Different Insides?
No animal can digest grass, so every grass-eater rents microbes — and whether it keeps them before the stomach or after changes everything else about it.
Let’s go →Running the engine hot
Why Does a Hummingbird Eat All Day?
Wings beating fifty times a second and a heart running past a thousand a minute add up to nearly its own weight in nectar taken in before dark.
Let’s go →Bread would be fine
What If Every Bee Vanished?
The crops that feed the most people are pollinated by wind, not bees — so losing bees costs us the colour of the plate rather than the calories.
Let’s go →A meal nothing else wants
How Does a Koala Eat Poisonous Leaves?
Eucalyptus is toxic to almost everything, which is exactly the point: a koala took the job nobody was competing for, and its liver pays the bill.
Let’s go →The only big cat that shares
Why Do Lions Live in Groups?
Lions are the one big cat that lives in a group, because open grassland makes sharing the hunt worth more than keeping the food.
Let’s go →Milk, hair and a warm inside
What Makes an Animal a Mammal?
A whale, a bat and you are all in one group. Milk is the test that never fails, with hair and home-made body heat as the other two marks.
Let’s go →A bear with a meat-eater's stomach
Why Do Pandas Only Eat Bamboo?
A panda has a meat-eater's short gut and eats only a tough grass, so it copes by chewing for half the day and spending almost no energy.
Let’s go →A net, not a bag
What Is a Pelican's Pouch For?
Eleven litres is about three times what a pelican's stomach could hold, and the same thin skin flutters in the heat to cool the whole bird down.
Let’s go →Eyes in front, and one good chance
What Makes a Good Hunter?
You can tell a hunter from its skull: eyes at the front, pointing the same way. It buys depth judgement at the price of ever seeing behind itself.
Let’s go →The shift nobody watches
Who Clears Away Dead Animals?
A dead animal vanishes from a forest in days: birds, then insects, then microbes take it apart in a reliable order and hand it to the soil.
Let’s go →Thousands of hiding places
How Does a Squirrel Find Its Buried Nuts?
A squirrel remembers roughly where it buried each nut, then finds the exact spot by smell — and the ones it forgets become trees.
Let’s go →Eating what would kill you
Why Don't Vultures Get Ill?
A vulture eats meat that has been dead for days and walks away well, because its stomach acid destroys the bacteria and their poisons.
Let’s go →Physics
Invisible forces you can play with — 1 story.
All physics →Math
Number ideas with toys — 1 story.
All math →How things work
Everyday machines, taken apart — 1 story.
All how things work →