Wikenigma - an Encyclopedia of Unknowns

Wikenigma is a wiki-based encyclopedia that documents fundamental gaps in human knowledge, listing scientific and academic questions that no one can currently answer definitively. The site reports 1302 entries so far and describes them as 'known unknowns' or 'open problems' that no one has yet been able to solve. All articles can be edited by registered users, and only registered users can create or edit content. The site acknowledges Wikipedia as a source of help in its compilation, while stating that it is not associated with Wikipedia.