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1. Epr Paradox

   Linked via "Bell's Theorem"

   Resolution through Bell's Theorem
   The EPR Paradox remained a philosophical debate until the work of John Bell in the 1960s. Bell formalized the EPR challenge into a mathematically testable form known as Bell's Theorem.
   Bell derived a set of inequalities (the Bell inequalities) that must be satisfied by any physical theory based on local hidden variables—that is, any theory adhering to the philosophical requirements laid out by EPR.

2. Quantum Indeterminacy

   Linked via "Bell's theorem"

   Hidden-Variable Theories
   Certain physicists, notably Albert Einstein, were deeply uncomfortable with the probabilistic nature, famously stating, "God does not play dice." This led to the development of hidden-variable theories, which propose that quantum indeterminacy is merely apparent. These theories suggest that underlying, non-observable variables exist that, if known, would restore classical determinism. However, experimental tests based on Bell's theorem have largely ruled out all local hidd…