What is cisnes negros?

"Cisnes Negros" is the Spanish term for "Black Swans," which refers to unexpected or highly unlikely events or occurrences that have a significant impact. The concept of "Black Swans" was popularized by Nassim Nicholas Taleb, a Lebanese-American essayist, scholar, and former Wall Street trader, in his book "The Black Swan: The Impact of the Highly Improbable." In the book, Taleb argues that many significant events in history were impossible to predict, and that people often make the mistake of assuming that rare or unlikely events will not occur. The term "Cisnes Negros" has since been used in a range of fields, from finance and economics to politics and philosophy, to describe events that are unpredictable but have a profound impact on society.