Look around you. Books, worksheets, exam papers, tissue, money — so much of it is paper. But about 2,000 years ago, paper did not exist.
Tap each one to find out why it was a problem.
The big problem: writing was either too heavy or too costly. China needed something light AND cheap. That is the story of paper.
Before paper, many Chinese books were made of thin bamboo strips. Each strip held only one line of characters. Hundreds of strips were tied together with string and rolled up like a mat.
A famous Chinese official once had to read government reports written on bamboo. It is said the strips filled several carts. About how heavy could one big bamboo "book" be?
Bamboo worked — but imagine bringing a cartload of sticks to school instead of one exercise book!
In the year 105 CE, during China's Han dynasty, an official named Cai Lun (say: tsai loon) worked in the emperor's palace. His job included making things for the court — so he thought hard about the writing problem.
Cai Lun's clever idea: don't hunt for something rare and expensive. Use the cheap, throw-away things lying around every village.
Tap the items you think he threw into the pot. Careful — two of these do NOT belong!
Cai Lun's team followed four steps. Every step has ONE job: break the材料 (materials) down into tiny fibres, then join them back together as a flat sheet.
Tap them one at a time, from FIRST to LAST.
The pounded fibres float in a big tub of water like a cloudy soup. The papermaker dips in a flat bamboo screen, lifts it up, and the water drains away — leaving a thin mat of fibres on top. That mat, dried, is paper.
Drag the slider to lift the screen out of the water. Stop when the sheet looks just right — not too thin, not too thick.
Why it works: water holds the fibres apart. When the water drains, the tiny fibres tangle and grip each other — like a bowl of noodles pressed flat. No glue needed!
For hundreds of years, papermaking was mostly a Chinese secret. Slowly it spread along the trade roads — merchants, travellers and, in one famous story, captured papermakers taught the skill to new places.
Tap the stops on the map to follow paper's journey.
It took roughly 1,000 years for paper to travel from China all the way to Europe. Today Singapore's exam papers, story books and hongbao all come from Cai Lun's idea.
Historians are careful people. Some "facts" about paper are true, and some are almost-true. Decide for each one.
Historian's tip: Cai Lun is famous not because he made the very first scrap of paper, but because he made paper good enough and cheap enough for everyone to use. That is what changed the world.
Try at home (with an adult): tear a used piece of paper into tiny bits, soak it in water overnight, mash it, then spread the mush on a cloth and let it dry in the sun. You have just done Cai Lun's four steps! ♻️
Well done — 2,000 years of history, learned! 🌟
Next time you hold an exam paper, remember: it started with someone deciding rubbish was worth a second look.