What invention made it possible to publish books about discoveries?

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The key idea is how knowledge gets into many hands. The ability to publish books about discoveries relies on mass-producing written works, and that came with the invention of the printing press. It introduced movable type and mechanized printing, which dramatically lowered the cost and time required to produce many identical copies. This made it possible to spread discoveries widely, support scholarly dialogue, and build libraries. Before printing, books had to be copied by hand, which was slow and expensive, limiting who could access new findings.

The other options don’t fit as well. The radio and the telephone transmit information or enable communication, but they don’t create printed, distributable copies of books. The typewriter helps with composing text, yet it doesn’t by itself enable mass publication and distribution of books.