JUNIOR EDITION for Ages 6+
Industries: From Raw Stuff to Rich Nations · Book 2

Cement: The Soup That Turns to Stone

How does grey soup turn into stone?

In this book, you will find out…

When you grow up, you could…

Who is in the story

AadhyaAadhyaMixes, waits, and tests everything.
CharlieCharlieAsks one good question — then lets Aadhya find out.
WarrenWarrenTurns up late. Thinks about a hundred years from now.

Today’s mystery

How does grey soup turn into stone?

Look for the clues. Try to guess the answer before Aadhya does!

Chapter 1

The Soup on the Street

🔍 How can a liquid become a floor?
Aadhya had walked past this grey wall ten thousand times.
Aadhya had walked past this grey wall ten thousand times.
Today she touched it. Cool, rough, solid.
Today she touched it. Cool, rough, solid.
AadhyaWhat even IS this stuff?
Down the road, workers were pouring a floor. It came as grey soup!
Down the road, workers were pouring a floor. It came as grey soup!
She stayed at the fence a long time.
She stayed at the fence a long time.
AadhyaIt’s liquid. How does it become a floor?
By evening, the soup was a floor. A truck was parked on it!
By evening, the soup was a floor. A truck was parked on it!
An old man stood beside her, looking at the same floor.
An old man stood beside her, looking at the same floor.
CharlieDo you know its name?
When she looked up from her notebook, he was gone.
When she looked up from her notebook, he was gone.
At home, Granny’s garden path was all mud. Aadhya had an idea.
At home, Granny’s garden path was all mud. Aadhya had an idea.
Aadhya’s notebook
My job: make Granny a stepping stone. It must not crumble in the rain.
Chapter 2

A World of Stacking

🔍 What did people build with before this?
First she counted. Kerbs. Paving. Pipes like giant macaroni. All grey!
First she counted. Kerbs. Paving. Pipes like giant macaroni. All grey!
Even the train rode on tall grey legs.
Even the train rode on tall grey legs.
Long ago, every wall started as part of a mountain.
Long ago, every wall started as part of a mountain.
Aadhya tried to lift one small block. Very short experiment!
Aadhya tried to lift one small block. Very short experiment!
AadhyaThis is one stair. ONE!
Mud bricks were cheap. But every rain washed a little away.
Mud bricks were cheap. But every rain washed a little away.
A big church could take a hundred years. Stone is slow.
A big church could take a hundred years. Stone is slow.
Aadhya wrote it down.
Aadhya wrote it down.
AadhyaNobody was slow. Stone was slow.
Chapter 3

The Recipe Rome Lost

🔍 Did anyone ever pour stone before?
Near a volcano, the Romans found a grey ash.
Near a volcano, the Romans found a grey ash.
Mixed with burnt lime and water, it set hard. And it got stronger!
Mixed with burnt lime and water, it set hard. And it got stronger!
They poured a whole dome. No bricks in it. One big piece!
They poured a whole dome. No bricks in it. One big piece!
They even poured it into the sea.
They even poured it into the sea.
Seawater did not ruin it.
Seawater did not ruin it.
AadhyaIt set UNDER water?
Then the empire faded. This arch waited for workers who never came back.
Then the empire faded. This arch waited for workers who never came back.
Nobody wrote the recipe down clearly. It was lost.
Nobody wrote the recipe down clearly. It was lost.
Aadhya crossed out a sentence in her notebook.
Aadhya crossed out a sentence in her notebook.
AadhyaI thought people never forget things. They do!
🔎 Clue found!
Something can be invented — and then lost again.
Chapter 4

The Bucket That Got Hot

🔍 What is the grey powder made of?
Aadhya brought home a pebble from the building site.
Aadhya brought home a pebble from the building site.
AadhyaSo what ARE you?
It begins as limestone. Look closely: tiny shells!
It begins as limestone. Look closely: tiny shells!
Long ago this was the bottom of a sea.
Long ago this was the bottom of a sea.
Burn it very hot, and a gas escapes.
Burn it very hot, and a gas escapes.
She poured water on burnt lime. The bucket got hot with no fire!
She poured water on burnt lime. The bucket got hot with no fire!
AadhyaIt’s HOT! Nothing is burning!
Her first stepping stone was mud. It dried — then crumbled. Fail!
Her first stepping stone was mud. It dried — then crumbled. Fail!
But cement is different. Aadhya guessed it — and was right.
But cement is different. Aadhya guessed it — and was right.
AadhyaIt’s not drying. It’s GROWING!
Tiny crystals grow and lock together. Even in a jar of water.
Tiny crystals grow and lock together. Even in a jar of water.
Aadhya’s notebook
Mud dries. Cement grows.
Chapter 5

The Dirty Lime

🔍 Which mix will survive the rain?
Far out at sea, a rock hid under the waves. Ships kept crashing.
Far out at sea, a rock hid under the waves. Ships kept crashing.
Two lighthouses had stood there. One burned. One blew away.
Two lighthouses had stood there. One burned. One blew away.
In 1756, an engineer named John Smeaton started with tests, not stones.
In 1756, an engineer named John Smeaton started with tests, not stones.
He put many lime mixes in water. Everyone said water would ruin them.
He put many lime mixes in water. Everyone said water would ruin them.
The pure white limes turned to paste. The dirty ones, with clay, went hard!
The pure white limes turned to paste. The dirty ones, with clay, went hard!
His lighthouse stood in the sea for over a hundred years.
His lighthouse stood in the sea for over a hundred years.
Aadhya wrote the surprise down.
Aadhya wrote the surprise down.
AadhyaEveryone cleaned the lime. The dirt was the secret!
🔎 Clue found!
A little clay in the mix makes it set under water.
Chapter 6

The Name on the Bag

🔍 How did the recipe become a powder in a bag?
A bricklayer named Joseph Aspdin burned limestone and clay on his own stove.
A bricklayer named Joseph Aspdin burned limestone and clay on his own stove.
Crush. Mix. Burn. Grind. Test. Then change one thing and try again.
Crush. Mix. Burn. Grind. Test. Then change one thing and try again.
He named it after a famous stone. That name is still on the bag!
He named it after a famous stone. That name is still on the bag!
AadhyaPortland cement!
Hotter fires made hard, glassy lumps. Ground up, they were even stronger.
Hotter fires made hard, glassy lumps. Ground up, they were even stronger.
Today a giant tube turns and turns, with a fire at the end.
Today a giant tube turns and turns, with a fire at the end.
The powder rolls down slowly, getting hotter.
The powder rolls down slowly, getting hotter.
AadhyaIt cooks for an hour!
A gardener put iron mesh inside his cement flower pots. They stopped cracking!
A gardener put iron mesh inside his cement flower pots. They stopped cracking!
Aadhya saw why at once.
Aadhya saw why at once.
AadhyaThe stone is strong when squeezed. The steel is strong when pulled!
Chapter 7

The Ninety-Minute Truck

🔍 Why does the cement truck keep turning?
At a cement plant, Aadhya stared.
At a cement plant, Aadhya stared.
AadhyaIt’s bigger than our whole town!
The fire burns all night. Stopping it costs too much.
The fire burns all night. Stopping it costs too much.
Aadhya made a guess about the truck.
Aadhya made a guess about the truck.
AadhyaIt turns so the soup doesn’t set inside!
She was right. A spiral inside keeps folding the mix.
She was right. A spiral inside keeps folding the mix.
Once water is added, the clock starts. A traffic jam can ruin a whole load!
Once water is added, the clock starts. A traffic jam can ruin a whole load!
A long arm lifts the soup to the eleventh floor.
A long arm lifts the soup to the eleventh floor.
From every load, workers make a small test cube.
From every load, workers make a small test cube.
After 28 days, a machine crushes it on purpose!
After 28 days, a machine crushes it on purpose!
AadhyaYou BREAK it to prove it works?
The number on the dial tells everyone it is strong enough.
The number on the dial tells everyone it is strong enough.
Aadhya’s notebook
Nobody can see inside a wall. So you test the cube.
Chapter 8

Granny’s Stone

🔍 Can Aadhya make a stone that lasts?
Aadhya mixed cement, sand, gravel and water. She poured a square mould.
Aadhya mixed cement, sand, gravel and water. She poured a square mould.
Charlie turned her test cube over in his hand.
Charlie turned her test cube over in his hand.
CharlieHow would you make it FAIL?
Aadhya knew.
Aadhya knew.
AadhyaToo much water. Or let it dry too fast. So I won’t!
Builders today try to use less cement. Making it gives off a lot of smoke.
Builders today try to use less cement. Making it gives off a lot of smoke.
Warren was sitting on a bench in the sunny courtyard.
Warren was sitting on a bench in the sunny courtyard.
WarrenWill that stone still be there when you’re grown up?
Aadhya thought of the hospital. Someone poured its floor on a Tuesday. It will stand for eighty years.
Aadhya thought of the hospital. Someone poured its floor on a Tuesday. It will stand for eighty years.
She set her stone in Granny’s path and touched the grey wall again.
She set her stone in Granny’s path and touched the grey wall again.
AadhyaPowder. Water. Patience. Stone!

All the clues

  1. Something can be invented — and then lost again.
  2. A little clay in the mix makes it set under water.

So… How does grey soup turn into stone?

Cement is burnt rock powder. When water joins it, tiny crystals grow and lock together — even under water. People found the right recipe, then learned to make it by the mountain.

OmahaIndia Junior · a simpler version of Book 1 for readers aged 6-8