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Cake day: June 13th, 2023

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  • What would happen is entirely your responsibility as the author of the scenario.

    Some options may be more “realistic” than others, but since the existence of a working time machine is already beyond what seems to be feasible physics (requiring ridiculous amounts and density of negative energy for example, where not even any has been shown to be possible to make) the scenario becomes soft sci-fi, or in other words magic, and that means it’s up to the writer to make up the rules.

    Here is a post I found with many of the options you can choose from.


  • Even knowing that everything happens every way in some other branch of the wave function (other universes) doesn’t really affect our own little section of it. There’s no communications or travel, so other universes if they exist have the same meaning to us as if they don’t. Except in time travel stories like this.

    Besides, the same “irrelevance” of decisions and events comes free with even one single universe given that it’s deterministic - as physics seems to be. (Yeah there’s quantum randomness, but random doesn’t help either)

    That said I still believe in free will and the importance of decisions. I just think it has to be defined so weakly that it still works in a deterministic universe. (So I have free will, but so do dice and pocket calculators.)







  • The only area I know well is the NW corner of the USA, but there is indeed public transit. I can’t say how it compares to even other parts of the US, let alone other countries, but I can say that in the urban and suburban areas it’s generally possible to walk or bike to a bus stop and with some transfers, get within a walkable or bicycle-able distance of where you are going. Some rural areas have a system called “dial-a-ride” which are basically on-demand small buses if I understand correctly. Similar systems exist for people with disabilities in the urban areas also.

    Besides buses there are also ferries, and local train systems (light rail) which connect neighborhoods and cities in the same major metropolitan area. Trains between major metros (such as between states) also exist, but typically it’s just not worth it: If you aren’t going to just drive it by car, then flying is both faster and cheaper than the train, and flying isn’t cheap.

    There are also commuter trains between the downtowns of major (nearby) cities separate from the light rail, but I’ve never actually tried that myself.