The Schwartzchild radius is the point at which… actually, I explained this on tumblr a few weeks ago. What we’re referencing here is the “problem” Einstein posed of anything passing through the Schwartzchild radius: it later turned out there was no problem, just that we were using the wrong set of graphing co-ordinates needed to describe it. That’s what the singularity and the manifold describing it is about; a bajingle is… well, that one’s pretty obvious if you’ve ever been fifteen years old.