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for a fascinating explanation on how Borges' imagination anticipated the "Many Worlds Interpretation" of quantum mechanics, see: The Garden of Forking Worlds by Alberto G. Rojo, physics PhD.
in his 1973 paper, Hugh Everett includes an epigraph from Borges' short story "The Garden of Forking Paths," published 16 years before Everett first postulated the "Many Worlds Interpretation".