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lsparrish comments on Building Weirdtopia - Less Wrong
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Technological/Cognitive Weirdtopia: Everyone runs on computronium, in a simulation that starts out rather like normal, but everybody has an undo button: at your option you can undo everything except progress made in your own mind, up to any point in your life since the simulation began. There are safeguards in place to prevent two people from doing this at the exact same time, but otherwise there are no limitations on use; you can redo a second or a century, once or a thousand times. It takes a lot of "real" time for the simulation to progress to everyone's satisfaction beyond the first five minutes.
I like this "universal Peggy Sue" idea. I wonder if the computronium might be replaced by weird physics.
One technology plausible in a time travel world could be undoing time travel changes by going back further in time and thereby preventing the time travel from occurring. Also, whether the passing of a given moment happens by deterministic or non-deterministic processes could be variable. In order to revisit a specific future you could always follow a particular previously determined worldline to it.
In my weirdtopian extrapolation of this notion, there's a vast set of worlds which trillions of people are swapping back and forth between all the time (with careful tracking of the necessary pasts using computerized transporters), without giving a moment's thought to the fact that they are destroying all of the previous universes they have been to. "Ah yes, my living room is in the Mesozoic era on Earth 12..."
Another related (but maybe less weird) scenario would be a world where time can be treated as a bankable resource. People could go into stasis for a day, then suddenly perform actions twice as fast over the following day, or instantly use up their day in the course of a moment. They would also be free to sell their days, thus getting shoved further into the future, or purchase new ones for productivity and/or relaxation purposes.