Hugh Everett's 'many-worlds' idea says there is no single reality — the wave function never collapses, and every quantum coin-flip spawns a world for each outcome. Follow the logic to its edge and you arrive at 'quantum immortality': since you can only ever find yourself in a branch where you survived, your own consciousness might experience an unbroken string of improbable survivals forever. Almost every physicist insists you should never act on this. Almost none of them can cleanly explain why it's wrong.
The best serious starting point. No mysticism — just a careful walk through what 'the universe splits' actually means, where all those branches are supposed to be, and why this is a real interpretation physicists argue about, not science fiction.
The core theory laid out: no wave-function collapse, no randomness in the underlying laws, just a universal wave function endlessly branching via decoherence. Includes the polls showing how seriously a chunk of physicists actually take it.
Its most prominent living champion makes the case that many-worlds is actually the simplest reading of quantum mechanics — that it's the other interpretations, with their mysterious collapses, that are doing something weird.
The tragic human core of the rabbit hole. Everett proposed the idea at 27, was dismissed by Niels Bohr's circle, left physics for defense work, drank and smoked heavily, and died at 51 — asking to have his ashes thrown out with the trash. He never knew his theory would win so many converts.
Here's where it turns personal and strange: if every outcome happens, then in the branches where a fatal event kills you, there's no 'you' left to notice — so your thread of experience may only ever continue in the branches where you survive.
The thought experiment in full: Max Tegmark's 'quantum gun,' the idea that you could in principle test many-worlds by surviving the impossible — and the sober, repeated warnings from physicists that this relies on idealized conditions and should never, ever guide a real decision.
The essential cold shower. A working physicist lays out exactly why she thinks many-worlds doesn't actually solve the problem it claims to — especially where probability comes from — so you don't leave this rabbit hole thinking it's settled science.
The unforgettable closer. Mark Oliver Everett — frontman of the band Eels — travels the world trying to understand the father he barely knew: Hugh Everett. A rock star reckoning with the dead genius who dreamed up infinite universes but could barely connect with the one he lived in.