See "Warping" below for a link to the Gary Falk article on COSMOS. Following is a short excerpt.
Stretching Einstein’s theory to its limits. One problem is the so-called singularity said to lie in the centre of a black hole. At a singularity, space and time are infinitely stretched. That’s both mathematically and physically awkward, to say the least. What can “infinite stretching” mean? And it gets worse. In the 1970s, Stephen Hawking applied quantum mechanics to the mathematical description of a black hole, and what he discovered was startling: black holes aren’t so black. Instead, they emit so-called Hawking radiation; given enough time, a black hole should completely evaporate away.