American meteorologist Edward N. Lorenz analyzed this effect in a 1963 paper submitted to the New York Academy of Sciences. "One meteorologist noted that if this theory were proven correct, the flapping of a seagull's wings could change the weather forever." In later lectures and papers he used the more poetic butterfly. The most common explanation of this effect is: "A butterfly in the Amazon rainforest in South America, flapping its wings occasionally, can cause a tornado in Texas two weeks later." But what if this happened in two worlds?
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