LWers who liked this may also like: http://sci-hub.bz/
About: https://en.wikipedia.org/wiki/Sci-Hub
Basically, if you search for something and they don't have it, there's a huge network of scientists with access to pay-walled journals, and one of them will add a PDF. They've grown larger than any of the journal subscription companies, and have the world's largest collection of scientific papers.
If it's worth saying, but not worth its own post, then it goes here.
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