An extraordinary spat has broken out after a Nobel prizewinning physicist was "uninvited" from a forthcoming conference because of his interest in the paranormal.

Details of the conference in August for experts in quantum mechanics sounded idyllic. Participants were due to discuss "de Broglie-Bohm theory and beyond" in the Towler Institute, which is housed in a 16th-century monastery in the Tuscan Alps owned by Mike Towler, Royal Society research fellow at Cambridge University's Cavendish Laboratory.

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