Yes from expected white to unexpected black was a change but then I wonder
what would constitute a "platypus event".
Philip
-----Original Message-----
From: Des Clark-Walker
Sent: Thursday, 17 January 2013 3:51 PM
To: Canberrabirds List
Subject: black-swan events
In recent reading of Nature I came across use of the term "black-swan
event'. Curious to know the meaning of this term and being a Western
Australian
I interrogated Google. There is a voluminous literature on black-swan
theory and events, going back to the time when all swans were
supposed to be white. In essence,
a black-swan event is a surprise, the event has a major effect and in
hindsight it could have been predicted. Attack on The World Trade
Center is an example.
I hope Geoffrey Dabb can dream up a suitable illustration?
Des Clark-Walker
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