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@ech @post @freemo @feld The 2/78 studies included in that MA about masks and covid show masks work. They also included a Danish paper that apparently ignore the bidirectional cover from masks. Moreover the whole analysis is about policies and they clearly state about adherence. A bad application of a policy doesn't prove it doesn't work. @post here is mixing up on topics to avoid the specific issues. That way to claim proofs could demonstrate everything.