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The Printing Press (1440)
The printing press is history's most transformative knowledge tool, slashing book production costs by 90%—a single press could produce 3,600 pages per day, surpassing a scribe's 2–3 pages by over 1,000-fold. This radical affordability enabled mass literacy, with 20 million books printed in Europe by 1500, triggering the Protestant Reformation and accelerating the Scientific Revolution.
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