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In his weird and luscious signature song, Wright captured something indelible and irreproducible — a vision of tomorrow haunted by the memory of yesterday.

“Back to the Future: The Musical,” based on the first of the time-travel films in the billion-dollar franchise, faces an additional hurdle: It hinges on a star performance that would seem to be irreproducible onstage.

Yet Watts’ crisply reliable beat kept them sounding vital — an irreproducible blend of chaos and beauty.

And money spent on invalid science is money wasted: one study puts the cost of irreproducible medical research in the U.S. alone at $28 billion a year.

But the data they produced were often wildly inconclusive, prone to varied interpretations and acquired from shifting, irreproducible perspectives.