 DATE: In the final conversation between Jack Weil and Bobby Duran,  Jack refers to the Butterfly Effect as if it was already theorized  and calculated. This is supposed to be the following days after the  Cuban Revolution blasts, in early 1959. Although the idea of the  ripple effect exists since before, the way Jack refers to it should  only be possible to know after that, as related to the work of  Edward Lorenz. This mathematician and meteorologist wrote a paper  for the New York Academy of Sciences in 1963 noting "One  meteorologist remarked that if the theory were correct, one flap of  a seagulls wings could change the course of weather forever." In  later speeches and papers, Lorenz used the more poetic word  butterfly.