In many worlds, the measurement problem is just evolution under the schortenger equation. It's just tiny, microscopic systems that are in a quantum superposition becoming entangled with the wider world and decohering. That would be the origin of now two parts of the superposition that you would actually qualify as separate worlds. In boston, where i am now, i certainly commute by subway all the time,. whereas when i'mi l a, it's the car.
Welcome to the November 2021 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!
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