Although we don’t know whether parallel universes exist, we know something else about them with certainty: many people instinctively dislike them, and whenever a physicist writes a book about them, the Web erupts with claims that they are unscientific nonsense.

My new book “Our Mathematical Universe” proved to be no exception. “Is this still science?” the biologist Mark Buchanan wondered on the pages of New Scientist, “Or has inflationary cosmology veered towards something akin to religion?” The physicist Peter Woit dismissed it as “grandiose nonsense”.

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