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  • For anyone who was interested but couldn't be arsed to look it up, normal* air is 21% oxygen, British Library is 15%, and it sounds like it's done by adding extra nitrogen.

    ** Not sure whether Euston Road counts as normal air

  • So if I take my Zwift setup in there I can get some red blood cell adaptation benefits? No wonder there are so many librarians in the pro-peloton.


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