Questions regarding the 4-dimensional background structure of our universe.

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Why doesn't this paradox disprove (some) multiverse quantum gravitational theories?

As I understand it, one theory of the multiverse is that there are an infinite number of universes separated by small distances in other (than our observable 3/4) dimensions and that gravity is weak ...
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What is the difference between a black hole and a wormhole?

I heard people say that a black hole is a single point of no return, and a wormhole is something which leads to another far-off point in spacetime. Some also say that a black hole can become a ...