Holy crap. These guys in Germany just cured AIDS! Of course, the procedure is so expensive, complicated, and risky that it's not replicable as a large-scale public health strategy, but we'll ignore that for a minute. Here's how they did it.
When a government agency, medical office, or another institution scans a document and uploads it to a Web site, the images are not searchable -- they contain pictures of text, not the text itself. This is the so-called "Dark Web" -- its sinister-sounding name is just a reference to how difficult it is to search.
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