I have heard all over that Einstein's equations could allow a wormhole to exist. That is, it is consistent with our current laws of physics for a wormhole to theoretically exist. My question is, however: What in the equation, or in the solution to an equation, makes the person solving it say: "Oh, this solution means that you can connect two areas of space-time with this 'wormhole'"? What in the solutions allows someone to see that something like this is possible? Thank you in advanced for your comments.