Each of these branes is its own universe and could have different laws. Further more these parallel universes could be closer than your computer screen, but in directions we can not perceive. Also since they are outside the space time of our universe, they would have a time all their own. The Bulk could even have its own distinct time or no time at all.

In M-theory, most of the strings of string theory; in our universe; are open and attached to our 3 brane at their ends, these in clued the particles that make up atoms and transmit three of the four forces.  Sense the atoms of our bodies are attached to our 3 brane we can not move off of it into the extra 7 dimensions. Furthermore since we perceive the universe entirely there interactions with electromagnetism (light) and interaction with matter; that is likewise attached to our 3 brane; we can not see or otherwise perceive the extra 7 dimensions. This is one reason why it is difficult but not impossible to test.

The exception among the four forces is gravity whose particle (graviton) is a closed loop, allowing gravitons to go out into the extra 7 dimensions, which is why gravity is so much weaker than, the other tree forces. This is an aspect of M-theory that provides the possibility of testing it in the near future.  

This also shows that interaction can occur between branes. In this case gravitons from one brane are shown interacting with another, this has been proposed an explanation for dark matter. It is likely that gravitons are not the only closed loop strings and that other particles are capable of interacting with other branes.

 

 One possibility is that some open strings could be attached to one brane by at only one end, and if another brane is close enough such strings could also be attached to the other brane thus providing another way for interaction to occur between branes.  

Another possible way for interactions to occur between branes is for them to come into contact with each other.  In fact collisions between branes have been proposed as a possible cause for the Big Bang proposed by Evolutionists as the beginning of the universe; however this is speculative and not a requirement of M-theory.

 Thus an important aspect of M-theory is the existence of realities parallel to ours and that interactions are possible between them and ours.  

M-theory and the Supernatural

 Once upon a time parallel universes were an unacceptable topic in physics.  It was a topic that resulted in ridicule. Partly because of the inherent difficulty in test such a model but it also extended from philosophical position of naturalism. The tendency was to see our universe as all the ever was, and all that ever will be, so the notion that there was any thing outside our universe simply came to close to religion for the taste of some. M-theory has changed that by bringing the idea of parallel universes into the mainstream of physics.

Since the supernatural can be considered as anything from outside our universe, the direct interactions between anything and anyone from outside our universe by definition are supernatural events. In fact the event where Christ appeared to his disciples in a looked room can be easily understood in terms of Christ being able move his resurrected body through higher dimensions since the room would be open to those. So by using parallel universes M-theory blurs the line between natural and supernatural, this not only provides a scientific door to the supernatural but is also provides a physical theory for possibly modeling such events in a testable manner.