A Brilliant Brain

Biography

Cai Lun was a Chinese eunuch and court official who invented the modern papermaking process during the Han Dynasty, transforming the technology from crude experimentation into a practical, scalable method. His innovation using plant fibers, water, and pressing techniques replaced expensive bamboo and silk as writing surfaces, democratizing literacy and preserving knowledge across centuries. This single invention fundamentally altered human civilization's ability to record, transmit, and accumulate information.

Key Facts

• Invented paper around 105 CE by combining plant fibers with water and pressing them into sheets
• Presented his innovation to Emperor He, who praised it as a remarkable achievement
• Used materials including hemp, tree bark, and fishing nets to create the first true paper
• His papermaking method remained the standard for over 1,000 years across Asia and eventually the world
• Died by suicide in 121 CE after losing imperial favor, though his legacy endured