For example, one of the principles of a Wikipedia entry is notability.

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For example, in a few minutes, and without even leaving Wikipedia, you can travel from the Tasmanian Devil to Tasmanian devils to Tasmanian tigers to thylacines to convergent evolution.

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Who remembers Amazon Auctions, for example, or Amapedia, Amazon's attempt to build a Wikipedia-like user-generated product directory?

ECONOMIST: Brain scan