Lawrence Krauss states that we have isolated a section of empty space and within this 'empty' space, particles pop in and out of existence, seemingly from 'nothing'. This cannot be extended to the entire universe came out of nothing. An artificial 'empty' space is still curved space-time. What curves it? Matter and energy elsewhere in the universe. He is the cosmologist/physicist and states this theory of something from nothing while simultaneously omitting the fact that any 'empty' space in this universe must also be curved, i.e., have gravitons, fundamental strings, or whatever transmits this curvature. Just because we cannot perceive what these particles come from does not mean that they come from nothing. That, again, makes no sense. A true universal nothingness would not have any characteristic, including curvature, else it would not be nothing.