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The Butterfly effect is a term used to describe the phenomenon of “sensitive dependence on initial conditions”. The term was coined by Edward Lorenz, a mathematician and a meteorologist, to describe the impossibilities in predicting complex sytem such as long-term weather behaviour.

In a non-mathematician way, the analogy is the flapping of a butterfly’s wing has the potential to create a disturbance that in the chaotic motion of the atmosphere will become amplified. This chaotic motion, in turn, changes the large scale atmospheric motion, causing long term behaviour that is impossible to predict.