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While it’s poetically evocative, like the beating wing of the butterfly that causes a typhoon, and mathematically pretty, the many-worlds interpretation is in any practical sense ridiculous.

But if you subscribe to the many-worlds interpretation of quantum mechanics, there’s another universe somewhere in which everybody — whether teen, adult, male, female or nonbinary — sings just like Alanis Morissette.

This, then, is my attempt to play with the many-worlds interpretation by way of Terry Pratchett.

Two decades later, the physicist Hugh Everett similarly postulated, in his “Many-Worlds Interpretation,” that “all possible future histories are real.”

A new book by physicist Sean Carroll examines “one of the most bizarre yet fully logical ideas in human history”: the many-worlds interpretation of quantum mechanics.