Card catalogs and the secret history of modernity

Card catalogs feel very old but are shockingly new. Merchants stored letters and slips of paper on wire or thread in the Renaissance. (Our word “file” comes from filum, or wire.) But a whole technology, based on scientific principles, for storing, retrieving, and circulating an infinitely extensible batch of documents? That is some modern-ass shit. And it helped create the world we all live in.

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