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“Knowledge loss” is a category for books that explore how ideas, skills, records, and cultural memories disappear, become inaccessible, or are deliberately erased—and what that means for people and societies. It spans nonfiction on endangered languages, fading indigenous and local know-how, archival decay and censorship, organizational brain drain, and digital obsolescence, as well as fiction that imagines worlds after libraries burn, histories are rewritten, or technologies are forgotten. Works in this genre examine the fragility of transmission across generations and systems, the power dynamics behind what is remembered or silenced, and the personal and collective costs of forgetting. They often foreground efforts to preserve, recover, or rebuild knowledge, from oral traditions and community archives to technological preservation, making the stakes of memory vivid and urgent.

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