This episode explores how paper, a fragile and unassuming material, became one of the most powerful forces in human history. Before paper, knowledge was heavy, rare, and difficult to preserve, recorded on stone, clay, parchment, or papyrus — materials accessible only to elites. Ideas moved slowly, and literacy was limited.

Everything changed around 105 CE in China, when Cai Lun refined papermaking using bark, hemp, cloth, and fishing nets. Paper was cheap, flexible, and easy to produce, allowing writing to spread beyond the wealthy. Over centuries, papermaking traveled through the Islamic world into Europe, where it faced resistance but ultimately transformed society.

With the invention of the printing press, paper fueled an explosion of books, education, science, religion, and political thought. It enabled newspapers ...