Traditiona physics is being challenged today by the "Theory of Everything" (the "Unified Theory" which was initially proposed by Einstein). The theory that everything from atoms to gravity are all governed by a single set of laws makes sense, but the 10 or 11 "dimensions" (size, microcosm-macrocosm, the word "dimensions" is realistically undefined) doesn't really seem to be defined as anything but a vague and abstract concept.
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About This Video
A quick discussion.