Well, it's important because what happens in that little situation, is that the particle - we said there were two particles, one of them escapes, one of them goes into the black hole - the one that goes into the black hole has - is a negative particle, has negative energy. It's like taking a minus sign into the black hole while the plus sign goes off into infinity. And in that way, it actually subtracts from what's in the black hole, and the black hole can get smaller. There's a big upshot to that, because as the black hole gets - and this was not discovered back when he first discovered Hawking radiation, this was a little later - what happens is that as this occurs and continues to occur, it's possible that the black hole will finally disappear entirely.