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Quantum theory continues to challenge our conception of reality

25 August 2021

2E8WY68 Quantum particle, quantum mechanics . 3d illustration

Jupe/Alamy

IT IS one of those delicious ironies of history that Albert Einstein received the , the theory of gravity for which he is now justly most famed, but largely for his contribution to a theory that he spent much of his later career trying to disown.

Perhaps that’s only right. After all, quantum theory notoriously allows things to be in two states at once, and divides minds as well as it – potentially – divides worlds.

At the time of Einstein’s award a century ago (in another irony, delayed for a year as the…

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