String Theory: The Best Explanation for Everything in the Universe

String theory is considered the leading “theory of everything,” but there’s still no empirical evidence for it. 

Quantum gravity - Wikipedia

In Theory, Can We String the Universe Together? - A Circle Is Round

Rethinking reality: Is the entire universe a single quantum object?

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Where Do Space, Time and Gravity Come From?

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String theory vs Loop quantum gravity: Wild hunt for Quantum Gravity:

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What was before the Big Bang? Everything you need to know - BBC Science Focus Magazine

Understanding universe Is string theory the theory of everything?

Loop quantum gravity: Does space-time come in tiny chunks?