On the History Channel, scientists explained it like this (I'll try & draw it later)...they drew straight lines extremely close together one after the other. For this, let's say 3 lines. They are so close as to almost touch. However, no single line intersects the other. Imagine an infinite number of lines, and you get the idea.Like a Chinese Finger Puzzle, a small "wormhole" attaches itself to two, or more of these lines, allowing one to pass through to one of the other realities. But, these are random - or so they think. I think that if a person has a strong form of ESP, they can actually open that wormhole up with their minds.
So, I have had to learn about myself all by myself all my life. It took me 45 years to like myself. I was always being told that I should behave one way or another. I'm tired of that....!!!