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Abstract
Quantum theory, developed in the early twentieth century by Max Planck, Albert Einstein, Niels Bohr and other luminaries, strips 'reality' of its usual meaning by seeming to say that nothing is certain about atoms or elementary particles until they are measured. Modern theoretical studies and exquisitely controlled experiments have revealed the newly important role of principles such as information causality, which puts a hard limit on the amount of information that can be deduced about a quantum system after it has been measured. [...]lacking oomph is the description of Bell's theorem, the 1964 watershed that enabled physicists to prove experimentally that entangled quantum particles exhibit 'non-locality' That finding upended the classical belief that things must exist in places.