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.
--
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 0521371406Albert Einstein
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Einstein, Albert
Eisenhower, Dwight D.
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