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Science paper piracy site Sci-Hub shares lots of retracted papers | 85 percent of invalid papers continue to be shared after they've been retracted.

85 percent of invalid papers continue to be shared after they’ve been retracted.

Generally, when a paper is retracted for being invalid, publishers issue an updated version of its PDF with clear indications that the research it contains should no longer be considered valid. "The availability of [unlabeled retracted articles] in the field of health sciences is particularly high," they note, "which indicates a significant risk of their unintended use and further citation in future research." It's worth noting that this was already recognized as a problem even in the absence of Sci-Hub, and a system called Crossmark was developed to make it easy to find the most up-to-date version of a paper, including any corrections or retraction notices.

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