supersix2, but that would assume that there is a need for a purpose. If they exist, then we can obviously exist with them existing, and may even require their existence for our existence (that would be a tautological argument if I have ever heard one, and a confusing one at that). If they do exist we might be able to find ways to exploit the nature of multi-dimensions like we have exploited the consequences of quantum mechanics, relativity, Newtonian physics, and every other advancement in our theories.
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