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mlerma54 (1)
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"...we never really find out WHY things changed. I would have liked an explanation. I mean, the power went out, and that's when it happened. But what exactly caused it?"
A solar flare caused the brief power outages and a weird change of world history involving the Beatles, Coke, cigarettes (and who knows what else). Jack was having a traumatic accident at the same time, which may have been the contributing factor for him to keep memory of how the world was before the change. As an explanation it indeed sounds weird and scientifically unsound, but this was not a movie about science.
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