The Blank Swan: To understand so called rare events.

People are often told what to do and not worry about those rare events such as stock market crash and recession. But in reality, those so called “rare events” are not rare at all. 

There is a New York Time best seller titled: The Black Swan.

http://www.nytimes.com/2007/04/22/books/chapters/0422-1st-tale.html?pagewanted=all