How much knowledge was lost when the Library of Alexandria was destroyed?

Imagine burning the entire internet - in the ancient world.

The answer

At its peak, the Library of Alexandria held an estimated 400,000 to 700,000 scrolls, representing the largest collection of human knowledge in the ancient world. Its destruction wasn't a single event but a gradual decline through multiple fires, political neglect, and religious conflict spanning centuries. Works by countless philosophers, scientists, and poets were lost forever, setting back fields like astronomy and mathematics by generations.

Source: Britannica

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