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What is a black swan?

What is a black swan? Here are some definitions.

Noun
  1. Cygnus atratus, an Australian swan whose feathers are black. [c. 1700]
  2. Something believed impossible or not to exist, of which an example is subsequently found.
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Examples
Natalie Portman The black swan Oscar winner rapped on SNL with The Lonely Island.
Both The Fountain and black swan had their own exhibits, the latter of which Sidhu also assisted on.
The natural history of Australia was little recorded in early Dutch voyages of the seventeenth century, although there were observations of wallaby, quokka, and black swan.
The focus of the investigation should not be on how to avoid any specific black swan, for we don't know where the next one is coming from.
The prospect of a black swan event is interesting and worth thinking about.
Viewed in this framework, all scientific theorisations are basically waiting for the black swan.

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