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I would like to object to the variance explanation: in the Everett interpretation there was not even one collapse since the Big Bang. That means that every single quantum-ly random event from the start of the universe is already accounted in the variance. Over such timescales variance easily covers basically anything allowed by the laws: universes where humans exist, universes where they don't, universes where humans exist but the Earth is shifted 1 meter to the right, universes where the start of Unix timestamp is defined to start in 1960 and not 1970, because some cosmic ray hit the brain of some engineer at exactly the right time, and certainly universes like ours but you pressed the "start training" button 0.153 seconds later. The variance doesn't have to stem from how brains are affected by quanum fluctuations now, it can also stem from how brains are affected by regular macroscopical external stimuli that resulted from quantum fluctuations that happened billions of years ago.
If it’s worth saying, but not worth its own post, here's a place to put it.
If you are new to LessWrong, here's the place to introduce yourself. Personal stories, anecdotes, or just general comments on how you found us and what you hope to get from the site and community are invited. This is also the place to discuss feature requests and other ideas you have for the site, if you don't want to write a full top-level post.
If you're new to the community, you can start reading the Highlights from the Sequences, a collection of posts about the core ideas of LessWrong.
If you want to explore the community more, I recommend reading the Library, checking recent Curated posts, seeing if there are any meetups in your area, and checking out the Getting Started section of the LessWrong FAQ. If you want to orient to the content on the site, you can also check out the Concepts section.
The Open Thread tag is here. The Open Thread sequence is here.