See the website as it satisfactorily question which is OK to be left "v odd2, it's a very odd "shop".  Explore Maths does both help to people needing maths as well as books and all sorts of resources like CDs and web links and courses for people too.  Therefore if you are satisfied with this point mark closed or this may have to go to some forum, all for the sake of its oddity.  There shouldn't be a category for everything see many principles applied here in my thinking: https://wiki.openstreetmap.org/wiki/Relations_are_not_categories