Quantum mechanics and general relativity are the two pinnacles of 20th-century physics. In their respective fields, scientists have demonstrated time and time again how correct these theories are. Still, we know that they have limitations. They do not work together well, especially in two particularly important areas: black holes and the Big Bang. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The search for a theory of everything, or at least one that incorporates both the quantum properties of reality and gravity, is ongoing. There are several candidates out there, and their limits are under constant investigation. Most of them are currently beyond our ability to test; usually, we test quantum mechanics or relativity, for example re

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