“Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed.”

— Albert Einstein

Objecting to the placing of observables at the heart of the new quantum mechanics, during Heisenberg's 1926 lecture at Berlin; related by Heisenberg, quoted in Unification of Fundamental Forces (1990) by Abdus Salam ISBN 0521371406
1920s

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German-born physicist and founder of the theory of relativi… 1879–1955

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