Knowledge by Consensus: A historical perspective

[note: this is sort of a continuation of this: What's Right or Wrong with Wikipedia?]

Last night I time-travelled back to see a version of Wikipedia from long ago. And here is what I found listed under "The World."

Wikipedia in the year 1200

The World

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orbis terrarum est campester
orbis terrarum est rotundus
il mondiale Ÿ piatto
il mondiale Ÿ rotondo
The World, she is round.
The World is Flat.

...This is what you get when anyone can decide what everyone else should know...I hope you people back in the future learned your lesson.