What is the best known “Theory of Everything” that is currently being examined?
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String theory is the name of the best-known hypothetical model that tries to unify all the behavior of everything in the universe. The basic idea is that the particles in our universe are only four-dimensional parts of multi-dimensional structures called strings. In this model, when particles interact in our universe, they are really interacting on many dimensions. The results, even though they may appear to be completely new particles, are just different “vibrational modes” of the same strings.