books.google.it - A black swan is a highly improbable event with three principal characteristics: It is unpredictable; it carries a massive impact; and, after the fact, we concoct an explanation that makes it appear less random, and more predictable, than it was. The astonishing success of Google was a black swan; so...http://books.google.it/books/about/The_Black_Swan_Second_Edition.html?hl=it&id=GSBcQVd3MqYC&q=matters&utm_source=gb-gplus-shareThe Black Swan: Second Edition
