I shall suggest on the contrary that all communication relies to a noticeable extent on evoking knowledge that we cannot tell and that all our knowledge of mental processes like feelings or conscious intellectual activities is based on a knowledge which we cannot tell.
But despite the universality of URLs we often forget that they're not just a handy way to address network resources. They're also valuable communication tools.
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The fact that we are I don't know how many millions of people yet communication complete communication is completely impossible between two of those people is to me one of the biggest tragic themes in the world.