Saving Knowledge
It turns out, what I "knew" about the Library of Alexandria was junk history, springing from the intersection of ancient and urban myths. I didn't realize that till recently. The library wasn't a collection in a single giant building, and it never held all the knowledge of ancient Egypt and Greece, though it was immense. It wasn't at its peak one day, and destroyed by fire the next, collateral damage in war.
https://hildabastian.wordpress.com/2026/10/21/saving-knowledge/