The Experiment That Proved Einstein Wrong About Reality — And What It Actually Means | Brian Greene

Einstein believed the moon is there when nobody is looking. He spent thirty years trying to prove it. He was wrong. In this video, Brian Greene walks through the complete story of local realism and its experimental demolition, from the EPR paper of 1935 to Bell's theorem of 1964 to the Nobel Prize-winning experiments of Aspect, Clauser, and Zeilinger, to the new evidence from quantum computers that has confirmed and extended the Bell results at unprecedented scale. Greene explains what local realism actually means, why Bell's theorem is a mathematical proof not just an experimental result, why quantum computers cannot work if hidden variables exist, and what it actually means that the universe does not consist of things with definite properties when no one is looking. He walks through the three main interpretations of quantum mechanics, Copenhagen, many-worlds, and Bohmian mechanics, explains what each says about the nature of reality, and explains why none is fully satisfying. And he follows the implications honestly to their conclusion: the strangeness of quantum mechanics is not a feature of some remote quantum scale with no connection to everyday life. It is a feature of the same particles that make up everything you experience. The classical world you inhabit is an emergent approximation. The underlying reality is something far stranger. Here is the physics that proves it. Subscribe to Brian Greene Universe for quantum physics taken all the way to its implications.