"The power of the community to decide, of course, asks us to reexamine what we mean when we say that something is “true.” We tend to think of truth as something that resides in the world. The fact that two plus two equals four is written in the stars—we merely discovered it. But Wikipedia suggests a different theory of... truth…. The community decides that two plus two equals four the same way it decides what an apple is: by consensus. Yes, that means that if the community changes its mind and decides that two plus two equals five, then two plus two does equal five. The community isn’t likely to do such an absurd or useless thing, but it has the ability." - Marshall Poe, about how Wikipedia has redefined common knowledge, 2006
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