The question is why are there three dimensions; why not more or less? Is there some natural preference in the universe for three dimensions or is it some cosmological accident?
Sting theory suggests more; 10 to be exact. But where are they and how come we can’t sense them? And what is so special about the three we are able to sense? Lisa Randall discusses these questions in Why do we live in a Three-Dimensional World, Seed Magazine.
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