The theories of quantum mechanics and general relativity have held up time and again at describing the physics of our universe at a micro and a macro scale, but when it comes to gravity, the two pose a major problem that physicists havent been able to resolve: for certain interactions, the two theories describe two different outcomes. Finding out what actually happens in those interactions isnt so simple — such interactions have minute differences that are seemingly undetectable. The biggest single problem of all of physics is how to reconcile [general relativitys] gravity and quantum mechanics, Philip Stamp, a theoretical physicist at the University of British Columbia, tells Quanta.
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