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12 pages, Audiobook
First published September 28, 2021
Every quantum event that produces divergent outcomes that a human-scale observer perceives forces a split between time lines. But most such divergences are insignificant: and they ultimately re-merge. It doesn't matter how a butterfly flaps its wings if nobody sees it, and eventually the bug collector goes home and memories fade and only the significant paths remain detectable.This explains not just Stross' individual concept of the multiverse, but the primary narrative necessity of alternative timelines in general—why it is that the alternities we can get to have any visible, interesting differences from our own universe at all.
—p.300