@Shufei Fully agree. The ony thing I'd like to add here: Wikipedia and Google shouldn't possibly delude us into thinking all knowledge *is* available online. They should focus on providing tools to preserve at least the majority of written, printed, paper-based artifacts that otherwise are fragile, expensive to keep "alive" and (as we see in Brazil) easily to be destroyed by a variety of environmental conditions and accidents - fire, climate, water damage, ... .
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