Schrödinger's cat

Schrödinger’s cat is a famous physics thought experiment, which presents a paradox in which a cat in a box is somehow simultaneously both alive and dead.

Wikipedia: In quantum mechanics, Schrödinger's cat is a thought experiment that illustrates a paradox of quantum superposition. In the thought experiment, a hypothetical cat may be considered simultaneously both alive and dead as a result of its fate being linked to a random subatomic event that may or may not occur. 

This thought experiment was devised by physicist Erwin Schrödinger in 1935,[1] in a discussion with Albert Einstein,[2] to illustrate what Schrödinger saw as the problems of the Copenhagen interpretation of quantum mechanics. (link)

Context: "A few weeks passed, then a few more; 34 weeks on, the JCPOA looks like Schrodinger's cat, not quite alive or dead."  An unenriching debate, The Economist. September 10, 2022, p51

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