One of Quantum Physics’ Greatest Paradoxes May Have Lost Its Leading Explanation

It’s one of the oddest tenets of quantum theory: a particle can be in two places at once — yet we only ever see it here or there. Textbooks state that the act of observing the particle “collapses” it, such that it appears at random in only one of its two locations. But physicists quarrel over why that would happen, if indeed it does. Now, one of the most plausible mechanisms for quantum collapse — gravity — has suffered a setback.

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