Wikipedia is editable by everyone - you for example. The idea is that if you post bogus, someone will notice and change it back (it remembers the changes made). That's why it's up-to-date on most stuff: if you saw an out of date gn'r page and could update it, i'm sure you would
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IMHO, Wikipedia is one of the greatest ways to find out stuff about everything.
ps: Everyone can set up their own wiki for collaborative collecting of knowledge linked in a sensible way. May the Google be with you
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