Scientists studying how light bulbs worked accidentally opened the door to the strange world of quantum physics — a realm where particles can be in many places at once, probability rules, and reality seems to exist only when observed. Einstein rejected this idea and argued that quantum theory had a hidden flaw. His challenge was largely dismissed until the 1960s, when physicist John Bell showed how to test whether Einstein or quantum mechanics was right. This experiment asks a profound question: does reality exist on its own, or do we bring it into being by observing it?
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