Theoretical physicist Lawrence Krauss clarifies how, over the last hundred or so years, trying to pin down the reality of nothingness has become astonishingly complicated. You know, the Biblical void? Um, no so much. Just because we can’t see anything doesn’t mean a space is actually empty. It’s all about the maddeningly unstable rules — if we can even call them that — of quantum physics.

Our favorite line of Krauss’ is this: “And in fact, for that kind of nothing, if you wait long enough, you're guaranteed by the laws of quantum mechanics to produce something.” Nothing’s just not what to use to be. Watch the video below for more:

The simple idea of nothing, a concept that even toddlers can understand, proved surprisingly difficult for the scientists to pin down, with some of them questioning whether such a thing as nothing exists at all. Watch the videos below!