I got interested in the concept after I watched "The Elegant Universe" Nova's online free video at PBS.org.

The idea of Multiple Universes in different dimensions that may be connected at least in effect by gravity coupled with the idea that if part of that other universe, namely a black hole did wink into our existence close by to us if only for a micro second would we survive?

The time factor is what interests me the most.

It takes time for things to get destroyed.

But how much time does it take to change time frames?

I did get a couple of nice sci fi book ideas from it though.

An advanced race finds a periodic winking of a black hole from another universe and they use it to transform regular metallic elements into super dense material for space craft construction, and time frame shifting experiments, the new technologies change the course of a war they are in with another race of beings.