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It's a theory," Roald said. "Multiple universes, maybe. Parallel timelines. The idea that every possibility actually exists and that the life we're living is only one of them. There's also the famous butterfly effect. It's chaos theory, pretty heady stuff, but basically it says that a change in something as tiny as the flap of a butterfly's wings can eventually affect the path and strength of something as huge as a hurricane. In other words, if you could keep the butterfly from flying at a certain time and place, you might prevent a hurricane>
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