Who Invented Paper, and When? Full History and Evolution

Who Invented Paper? History agrees on one name when it comes to modern paper: Cai Lun (Tsay Lun).

Have you ever thought that our world—knowledge, history, economy, even our emotions—depends on one delicate thing? Paper.

In this modern world, when digital screens are everywhere, paper importance can’t be denied. But where did paper come from? Who invented it? And has its secret been hidden for centuries?

Let us go on a journey through history and find the truth behind the invention of paper.

Who Invented Paper? Full History

Paper is everywhere. It’s in the packages at your door, the books you read, the money in your pocket, and your shopping receipts. But most people never think about where paper came from or who invented it.

Today, the paper industry is huge. In 2025, it is worth about $394 billion and is expected to grow even more in the coming years. All of this started because one man in China had a smart idea nearly 2,000 years ago.

Before paper, people used heavy and expensive materials to write on, like wood, bamboo, or cloth. This made writing difficult and limited. When paper was invented, it made writing easier, cheaper, and more common. It helped spread knowledge and changed the world.

But this powerful invention was kept secret in China for about 500 years. It was protected like a national treasure. Later, after a major battle, the secret spread to other regions and slowly reached the rest of the world.

This is the story of paper—from early bamboo and simple materials to modern paper factories and new smart technologies used today.

Before Paper: Ancient Writing Materials and Their Limitations

For thousands of years, people struggled to find a good way to write and store information. Every method they used had problems, which made learning and sharing knowledge difficult.

Clay Tablets and Stone (3000 BCE and Earlier)

In ancient Mesopotamia (modern Iraq), people wrote on clay tablets using sharp tools.

Problems:

Very heavy
Easily damaged by water
Hard to carry
Slow and difficult to write

Some messages were carved into stone. These lasted long but took a lot of time and effort.

Papyrus (Ancient Egypt)

Egyptians made papyrus from plant strips pressed together. It was the first material similar to paper.

Advantages:

Lighter than clay
Easy to roll and store

Problems:

Easily torn
Damaged by moisture
Hard to use
Only made in Egypt

👉 Important: Papyrus is not real paper. It is made by layering strips, while real paper is made from pulp.

Parchment and Vellum (Medieval Times)

These were made from animal skin (sheep, goats, calves).

Advantages:

Very strong and long-lasting
Good for detailed writing

Problems:

Very expensive
Needed many animals
Took a lot of time to make
Only rich people could afford it

Bamboo and Silk (Ancient China)

Bamboo Strips

Chinese people wrote on bamboo strips tied together.

Problems:

Extremely heavy
Hard to carry
Difficult to store
Not easy to read

Silk Cloth

Silk was also used for writing important documents.

Advantages:

Light and smooth
Good for writing

Problems:

Very expensive
Only rich people could use it

The Big Problem

All these materials had major issues:

Too heavy (clay, stone, bamboo)
Too expensive (silk, parchment)
Too fragile (papyrus)
Too hard to produce

The Need for Something Better

By the 1st century CE, people needed a writing material that was:

Light and easy to carry
Affordable for everyone
Strong and long-lasting
Easy to make in large amounts

👉 The solution came from ancient China—and it changed the world forever.

Who Was Cai Lun? The Man Behind Paper

Cai Lun was a government official in ancient China during the Han Dynasty. He is known as the man who improved the process of making paper—something the world still uses today.

He was born around 50–62 CE in a poor family. Not much is known about his early life, but he worked hard and slowly rose in the royal court.

His Rise in the Royal Court

Cai Lun worked in the emperor’s palace and gained important roles over time:

Managed royal documents
Worked with the imperial library
Supervised making of tools and supplies

Because of his skills, he became a trusted advisor.

The Problem That Changed Everything

One day, the emperor saw a big problem in the royal library:

Books made of bamboo and wood were very heavy
Hard to carry and store
Difficult to use

The emperor asked Cai Lun to fix this issue.

👉 This problem inspired him to find a better writing material.

The Invention of Paper (105 CE)

After years of testing, Cai Lun found a smart solution.

Instead of expensive materials, he used:

Tree bark
Hemp
Old cloth (rags)
Fishing nets

He mixed these with water, turned them into pulp, and formed thin sheets.

👉 This became the first real paper-making method.

The emperor was impressed and rewarded him.

A Smart Idea from Nature

Some stories say Cai Lun got his idea by watching wasps.

Wasps chew wood and turn it into paper-like nests.
👉 This is very similar to how paper is made.

A Famous Story (Legend)

There is also a popular story about him:

People didn’t believe in paper at first.
So Cai Lun pretended to die. His family burned paper as an offering.

Then he came back alive and said:
👉 The paper helped him return.

After this, people started believing in paper’s value.

His Sad Ending

Even after his success, his life ended sadly.

Due to palace politics:

He was accused of being part of a plot
Ordered to be punished

Instead of facing humiliation, he took poison and ended his life.

His Lasting Legacy

Even today, Cai Lun is remembered as one of the most important inventors in history:

The only known inventor among China’s great inventions
Ranked among the most influential people in history
Worshipped as a symbol of paper-making
His hometown still produces paper

How Cai Lun Made Paper

Using Waste Materials

His biggest idea was using things people threw away:

Tree bark
Hemp fibers
Old clothes
Fishing nets

👉 Turning waste into something useful was a revolutionary idea.

Simple Paper-Making Process

1. Collect Materials

Gather and cut raw materials into small pieces.

2. Soak and Beat

Soak in water and beat them until soft pulp forms.

3. Make a Mixture

Mix pulp with water evenly.

4. Form Sheets

Pour mixture onto a flat screen to shape paper.

5. Drain Water

Let water flow out and press the sheet.

6. Dry the Paper

Hang it to dry in the sun.

👉 The fibers stick together and form strong paper.

Why This Was So Special

Cai Lun’s paper was:

Light
Strong
Cheap
Easy to make
Good for writing

👉 It was much better than bamboo, silk, or papyrus.

What About Earlier Paper?

Paper-like materials existed before him, but they had problems:

Poor quality
Hard to make
Not reliable

👉 Cai Lun didn’t just invent paper—he improved and standardized it.

Why He Matters

His work made paper:

Easy to produce
Affordable for people
Available across the empire

👉 This helped spread knowledge and changed the world forever.

How Paper Improved After Its Invention (105 CE)

After Cai Lun introduced papermaking, the story didn’t stop there. In fact, this was just the beginning. Chinese craftsmen quickly started improving the process—and what followed was a wave of innovations that made paper stronger, smoother, cheaper, and more useful than ever before.

Within just a few decades, paper was no longer a simple experiment. It became one of the most important materials in human history.

New Materials: Turning Nature Into Better Paper

Chinese papermakers began experimenting with different natural fibers to improve quality:

Bamboo → Strong and long-lasting (used for official records)
Mulberry Bark → Smooth and high-quality (premium paper)
Hemp & Rattan → Durable and flexible (daily use papers)
Seaweed (later in Korea) → Unique texture and adaptability

👉 This was revolutionary because paper could now be made in different grades, from cheap everyday sheets to high-quality writing paper.

Smart Technology: Making Paper Even Better

1. Sizing (A Game-Changer Innovation)

One big problem with early paper was that ink would spread too much.

To fix this, Chinese makers added starch or animal glue on the surface.

✔ Result:

Ink stayed clear and sharp
Writing became neat and readable
Paper lasted longer

2. Dyeing & Insect Protection

Chinese papermakers discovered something surprising…

They started coloring paper yellow, not just for beauty—but for protection.

✔ Why yellow?

It repelled insects
Protected documents for centuries
Became a symbol of royal authority

3. Improved Paper Molds (Production Breakthrough)

Early paper molds were rough and slow to use.

Chinese innovators created:

Smooth bamboo screens
Fine mesh molds
Reusable frames

✔ Result:

Faster production
Even, smooth sheets
Mass production became possible

👉 This small change helped turn paper into a large-scale industry.

Different Forms of Paper

Paper wasn’t just one thing anymore—it evolved into multiple formats:

Scrolls

Long sheets joined together
Used for books, art, and official texts

Flat Sheets

Standard sizes for daily writing
Easy to store and transport

Decorative Papers

Used in art, ceremonies, and religion
Designed for beauty and culture

The Big Impact: How Paper Changed China

By the 3rd century CE, paper had completely transformed Chinese society:

✔ Became the main writing material
✔ Spread to Korea, Japan, and Vietnam
✔ Made knowledge cheaper and accessible
✔ Boosted education and literacy
✔ Strengthened government record-keeping

Before paper, knowledge was limited to the rich.
After paper, learning became available to everyone.

China’s 500-Year Monopoly on Papermaking

One of the most surprising facts in history is this:

👉 After Cai Lun invented paper around 105 CE, China kept the secret hidden for nearly 500 years.

This wasn’t an accident.
It was a smart and powerful strategy.

China knew that paper was not just a material—it was power.

Why China Protected the Secret

1. Economic Power (Money & Trade)

Paper quickly became a valuable product.

China exported paper at high prices
Other countries depended on Chinese supply
It strengthened trade routes like the Silk Road
The empire earned huge wealth

👉 Controlling paper meant controlling global trade advantage.

2. Political & Military Advantage

Paper made China stronger from the inside.

Better record-keeping for taxes and population
Faster communication across the empire
Organized military planning and strategies
Stronger administration than rival nations

While others struggled with heavy materials, China had efficient systems.

3. Cultural Dominance (Knowledge = Power)

Paper helped ideas spread faster.

More books, more learning
Preservation of knowledge for generations
Growth of philosophy, science, and art
Expansion of Chinese culture beyond borders

Paper turned China into a knowledge superpower.

Strict Rules to Protect the Secret

China treated papermaking like a top-secret technology.

Possible restrictions included:

Only trained workers could learn the process
Papermakers were not allowed to leave the country
Sharing secrets was strictly forbidden
Serious punishment (even death) for leaks
Government control over production

👉 In simple words: Paper was guarded like gold.

How Long Did the Secret Last?

China successfully protected papermaking for 500–600 years:

105 CE → Paper officially introduced
6th century → Spread to Korea & Japan
7th century → Reached Central Asia
751 CE → Turning point (Battle of Talas)
After 751 CE → Secret begins spreading worldwide

👉 That’s centuries of control over one of the most important inventions ever.

How the Secret Slowly Leaked

Even the strongest secrets can’t stay hidden forever…

1. Buddhist Monks

Traveled across Asia
Carried books and knowledge
Introduced papermaking in new regions

2. Traders on the Silk Road

Observed papermaking techniques
Shared ideas during travel
Spread knowledge slowly

3. Cultural Exchange

Scholars and artists shared skills
Diplomatic missions carried knowledge
Curiosity led to discovery

👉 Still, the spread was slow…
The real breakthrough came after a major war.

The Curiosity Twist

For centuries, the world didn’t know:

How paper was made
Why China was so advanced
What secret gave them this advantage

Then suddenly…

⚔️ A single battle changed everything.
⚔️ Skilled papermakers were captured.
⚔️ And the secret finally escaped China.

👉 That moment reshaped world history forever.

From a Chinese Secret to an Asian Revolution

After Cai Lun invented paper, China tried to keep it secret—but knowledge has a way of traveling.

Slowly, through monks, traders, and cultural exchange, papermaking began spreading across Asia. And once it left China… every region made it even better.

Korea: The First to Improve Paper (6th Century)

Korea was one of the earliest countries to adopt papermaking.

But they didn’t just copy China—they improved it.

Key Innovations

Used rice straw and seaweed
Experimented with local plant fibers
Created stronger and more flexible paper

👉 This gave Korean paper a unique identity.

Big Achievement

Korea later invented metal movable type (1234 CE)—centuries before Johannes Gutenberg.

👉 This made Korea a printing pioneer long before Europe.

Japan: Turning Paper into Art (7th Century)

Papermaking reached Japan around 610 CE, likely through a Buddhist monk named Don-Cho.

At first, paper was used for:

Government records
Official documents

But then something changed…

The Role of Buddhism

Religious texts increased demand for paper
Monasteries became production centers
Paper became part of daily life

Japanese Innovation: Washi Paper

Japan didn’t just use paper—they perfected it.

What is Washi?

Strong yet lightweight
Beautiful and artistic
Long-lasting and flexible

Unique Uses

Room dividers (paper walls)
Fans, lanterns, umbrellas
Even samurai armor made of paper

👉 In Japan, paper became more than material—it became culture.

Tibet & Central Asia: Silk Road Expansion (7th Century)

Papermaking moved further through the Silk Road trade network.

In Tibet

Replaced palm leaves for writing
Used mainly for Buddhist texts
Book shapes still reflect old traditions

In Central Asia

Cities like Samarkand became early production hubs.

👉 Here’s the interesting part:

Even before the famous battle, Chinese papermakers were sometimes captured and forced to teach their skills.

This hinted at what was coming next…

The Silk Road Effect

By the 8th century, papermaking had spread across:

China → Korea → Japan
China → Tibet → Central Asia

👉 But it still hadn’t reached the Islamic world or Europe.

That required a dramatic event…

The Turning Point: Battle of Talas (751 CE)

This was the moment that changed everything.

What Happened?

Tang China vs Abbasid Caliphate
Battle took place in Central Asia
The Abbasids won

👉 But the real victory wasn’t land—it was knowledge.

The Secret Finally Escapes

After the battle, the Abbasids captured Chinese prisoners, including skilled papermakers like Tou Houan.

👉 They were forced to reveal the secret of papermaking.

This ended China’s 500-year monopoly forever.

Islamic World: From Craft to Industry (8th–10th Century)

Once papermaking reached the Islamic world, it didn’t just survive—it evolved rapidly.

Major Islamic Innovations

1. New Materials

Since Chinese materials weren’t available, they used:

Cotton
Linen
Flax

👉 Result: Stronger and more durable paper

2. Machine-Based Production (Tri-Hammer System)

Instead of hand beating fibers, they used mechanical hammers powered by:

Water
Animals
Human force

👉 This was revolutionary:

Faster production
Lower cost
Better quality
Mass production possible

3. Stronger & Thicker Paper

More durable sheets
Different paper types for different uses
Suitable for books, science, and records

Industrial Centers of Papermaking

Major cities became paper hubs:

Samarkand
Baghdad
Damascus
Cairo
Cordoba & Granada

👉 By the 10th century, the Islamic world was the global leader in papermaking.

Impact: The Rise of Knowledge

Paper transformed the Islamic world:

Growth in science & mathematics
Expansion of libraries
Preservation of ancient knowledge
Translation of Greek, Indian, and Chinese texts

👉 This led to the Islamic Golden Age (8th–14th century).

Europe’s Journey: From Resistance to Revolution (12th–15th Century)

Papermaking reached Europe much later than Asia. It took over 400 years after the Battle of Talas (751 CE) for paper to become common in Europe.

Why Europe Was Slow to Accept Paper

1. Religious Resistance

Early European Church leaders did not like paper because it came from the Islamic world. They preferred traditional parchment made from animal skin.

2. Legal Ban (1221 CE)

In 1221, Emperor Frederick II declared that official documents written on paper would not be accepted in law. This was done to protect old traditions and industries.

3. Economic Interests

Parchment was expensive and made money for powerful landowners. Cheaper paper was seen as a threat to their business.

Gradual Growth of Paper in Europe

First Paper Mill (12th Century)

The first paper mill in Europe started in Spain (Valencia/Xativa) around 1120 CE, introduced by Muslim rulers.

Spread Across Europe

Italy (Fabriano) became famous for quality paper
Germany and other regions followed
Paper mills slowly increased across Europe

Europeans adapted the technology using local materials like linen and cotton rags.

The Big Change: Printing Press (1440 CE)

Johannes Gutenberg invented the printing press around 1440 CE.

This changed everything:

Books could be printed faster
Demand for paper increased rapidly
Paper became cheap and widely used

Impact on Europe

Books Became Affordable

Major Movements

Paper helped power:

Renaissance
Reformation
Scientific Revolution
Enlightenment

Ironically, the same paper that was once rejected became the foundation of Europe’s progress.

Life of Medieval European Papermakers

Before machines, papermaking was hard manual work.

Raw Material

They used old clothes (rags), mainly linen and cotton.

Simple Process

Collect and sort rags
Soak and beat them into pulp
Mix with water
Dip a screen to form sheets
Press out water
Dry the sheets
Finish and smooth the paper

Hard Work and Skill

Papermaking was a skilled job:

Workers joined guilds
Training was required
Quality control was important
It was respected work in society

Colonial America and the Start of American Papermaking (15th–18th Century)

England and Paper Supply

England started making paper later than other European countries. When America became a colony, it depended on England for paper.

Paper was imported from England
It was expensive and limited
England controlled the supply

This created economic dependence on England.

First Paper Mill in America (1690)

The first American paper mill was built in 1690 in Germantown, Pennsylvania.

Founder: William Bradford
Location: Near Philadelphia

Why it was important:

Reduced dependence on England
Created local jobs
Made paper cheaper in America
Helped printing and publishing grow
Showed America could produce its own goods

Early American Papermaking

American paper mills used the same old methods from Europe:

Collect old cloth (rags)
Soak and beat into pulp
Form sheets using molds
Press and dry the paper
Finish for writing use

But there was a big problem:

👉 There were not enough rags to meet demand.

Shift to Wood Pulp (19th Century)

As America grew, paper demand increased fast. Rags were not enough, so a new solution was needed.

Why wood was used:

America had huge forests
Wood was cheap and easy to find
It was available in large amounts
Better for mass production

So papermakers started using wood instead of cloth.

This changed everything and helped paper become cheap and widely available.

Industrial Revolution and Machines (19th Century)

For thousands of years, paper was made by hand. This changed during the Industrial Revolution.

Key invention: Paper Machine

First machine: 1799 (France)
Improved design: Fourdrinier machine (1800s)
First US machine: 1817

Why it was important:

Paper could be made continuously
Production became very fast
Cost of paper dropped
Large-scale production became possible

One machine could produce as much paper as many workers combined.

Wood Pulp Revolution (1844)

A German inventor created a machine to grind wood into pulp.

Benefits:

Unlimited raw material (trees)
Much cheaper than cloth rags
Faster production
Lower cost of paper

Now paper became affordable for everyone.

Impact on Society

Cheaper paper changed the world:

Everyday Use:

Newspapers became common
Books became cheap
Packaging and wrapping increased
Cardboard and tissue paper were invented

Education and Society:

More people learned to read
Schools expanded
Knowledge spread faster
Science and research grew

Business and Communication:

Offices used more paper
Records and documents increased
Trade and communication improved

The Modern Paper Industry: A $551 Billion Global Market (2025)

Even in today’s digital world, the paper industry is still one of the biggest industries in the world.

Market Size (2025)

Global paper industry: $394 billion
Expected growth by 2034: $551 billion
Annual growth rate: 3.8%
Asia-Pacific holds the largest share of the market

Regional Market

Asia-Pacific: fastest growing and largest market
North America: strong but smaller share
Europe: also a major producer and consumer

What is Driving Growth?

1. Packaging Industry Boom

Packaging is the biggest part of the paper industry.

Why it is growing:

Online shopping is increasing
People want eco-friendly packaging instead of plastic
Paper boxes and wraps are in high demand

2. E-Commerce Growth

Online shopping is growing very fast worldwide.

Trillions of dollars in global online sales
More delivery boxes and packaging needed
Paper is widely used for safe shipping

3. China’s Huge Production

China is one of the largest paper producers in the world.

Produces over 100 million tons of paper yearly
Supplies both local and global markets
Strong industrial growth supports production

4. Eco-Friendly Trend

People and governments are trying to reduce plastic use.

More demand for recyclable paper
Use of natural materials like bamboo and plant fibers
Focus on sustainability

5. Hygiene Products

Paper is also used for daily hygiene items.

Tissue paper
Toilet paper
Napkins and sanitary products

After COVID-19, demand increased even more.

Specialty Paper Growth

Special types of paper are also growing fast.

Used in:

Food packaging
Medical and industrial uses
Construction materials
Adhesive and tape industries

Modern Paper Innovations (21st Century)

Waterproof and Water-Resistant Paper

Today, special paper is made that can handle water and moisture.

Used outside for signs, labels, and packaging
Used on ships and marine equipment
Used in food packaging to stop getting wet
Used on drink labels like beer and soda bottles

Fire-Resistant Paper

This paper is treated so it does not catch fire easily.

Used in factories for safety rules
Used by the military for important documents
Used on machines as warning labels
Used in buildings for fire safety materials

Eco-Friendly Paper

New paper types are made to protect the environment.

Bamboo paper grows faster than trees
Hemp paper is strong and sustainable
Made from crop waste like straw and sugarcane leftovers
Made by mixing recycled paper with new fibers

Smart and High-Tech Paper

Paper is now combined with technology.

Paper with RFID chips for tracking
Used in supply chain and product tracking
Conductive paper used in electronic circuits
Thermochromic paper changes color with temperature
QR codes connect paper to digital content

Industrial Special Paper

Strong paper made for heavy-duty use.

Used for filtering air and liquids
Used for electrical insulation
Used in cars and aircraft
Used in factories and industries

Paper in the Digital Age (2025)

Even with computers and phones, paper is still very important.

Digital world vs Paper

Paper did NOT disappear—it changed.

Newspapers are now partly digital but print still exists
Offices use less paper, but contracts are still printed
Books exist in both print and digital form
People still like handwritten notes and letters
Legal and government documents still need paper

Where paper is still used

Everyday life

Shopping bags and packaging
Money, receipts, tissues, and napkins

Education & work

Books, notebooks, and exams
Contracts and reports
Medical and legal papers

Creative use

Art, crafts, and decoration
Photography prints
Kids’ learning materials

Why paper is still important

Easy to use – no electricity or internet needed
Long-lasting – can be stored for years
Better learning – many people understand better from paper
Legal need – many documents must be printed
Eco-friendly option – recyclable and biodegradable
Reliable – does not depend on technology
Personal touch – handwritten notes feel special

Future of Paper

Paper will not disappear. Instead:

It will be made in more eco-friendly ways
More recycling will be used
It will work together with digital technology
It will be used for special purposes

Paper Recycling Revolution

How recycling works

Old paper is collected and turned into new products like:

Notebooks
Cardboard boxes
Bags and envelopes
Tissue and packaging
Newspapers

Recycling facts

Paper recycling rates are increasing every year
Around 80% of paper mills use recycled paper
Paper is one of the most recycled materials

Benefits of recycling

Protects forests

Less cutting of trees
Saves wildlife and nature

Saves energy

Uses less energy and water
Produces fewer emissions

Reduces waste

Less trash in landfills
Less pollution

Helps climate

Lowers carbon emissions
Supports climate protection

Circular system of paper

Paper goes in a cycle:

Used paper → Collected → Recycled → New paper → Used again

One paper can be recycled many times.

Recycling problems

Dirty paper cannot be recycled
Plastic-coated paper is hard to recycle
Some areas lack recycling systems
Costs and demand can change

Future improvements

Better recycling technology
More public awareness
Improved collection systems
Stronger recycling industries

📜 10 Fascinating Facts About Paper History

1. 🐝 Inspiration from Paper Wasps

A story says Cai Lun got the idea from wasps. Wasps make nests by chewing wood and turning it into a paper-like material. This inspired the idea of making paper from plants.

2. 🏆 One of China’s Great Inventions

China has four great inventions:
compass, gunpowder, printing, and paper. Cai Lun is the only inventor whose name is clearly known.

3. 🌍 Very Influential Person

Some researchers rank Cai Lun as one of the most important people in history (7th place). This shows how big his impact was on the world.

4. 🙏 Treated Like a God

After his death, people respected Cai Lun so much that they treated him like a god of papermaking.
Paper workers used to honor him in temples.

5. 🏛️ His Town Still Remembers Him

His hometown in China still makes paper today. There is a temple and museum built in his honor.

6. 🔥 Paper Burning Tradition Story

A famous story says Cai Lun faked his death. When people burned paper for him, he came out alive. After this, people started burning paper in rituals.

7. ⏳ China Kept Paper Secret for 500 Years

China kept papermaking a secret for a very long time. Other countries learned it much later.

8. ⚔️ Battle That Spread Paper

In 751 CE, a battle led to Chinese paper makers being captured. They shared the secret of paper with the Islamic world. This helped paper spread globally.

9. 🌍 Paper Took 1500 Years to Spread

Paper started in China in 105 CE. It reached Europe after many centuries and later America. It took around 1500 years to spread worldwide.

10. 🖨️ Printing Press Increased Paper Use

When Gutenberg invented the printing press, paper became very important. Books and knowledge started spreading quickly in Europe.

Conclusion

The invention of paper wasn’t just an engineering. It was a way to free human thought. From the first paper made from Cai Lun’s mulberry bark to today’s high-tech paper mills, paper has impacted every aspect of human life. And when you write something on a piece of paper today, or read an old book, remember that behind it lies a 1,000-year-old dream of a Chinese man, and a centuries-old secret of a baritone empire.

Our world of facts depends on the foundation of this delicate paper.