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#471 - Jim Al-Khalili - Physics Is Far Stranger Than You Think
Modern Wisdom
The Challenge of a Grand Unified Theory
When we bring gravity in, we start talking about a theory of everything. Gravity is our best theory of the nature of space and time. But it's very different from the theories describing the quantum world. We want to unify the theory of small quantum mechanics and the theory of the large general relativity. Because they 're very different structures, we don't know how to mesh them together. String theory one of the candidates for such a theory, but we don't knows for sure if it's right.
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