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Currently it is not possible to require evidence in support of "facts" stated outside of main space. There appear to be two, equally compelling reasons for this:

  1. Allowing anyone to demand evidence for any particular statement would immediately require that every other statement had to be cited, which would be something of a burden especially on newbies
  2. Nothing could be described as a reliable source any more, because that would require an infinite regression of reliable sources to back each other up