First, you have to clearly define nothing, since it isn't an official scientific term. Scientists talk about empty space as well as a state in which space and time themselves don't exist. Either type of nothing can spontaneously produce stuff.I've mentioned Krauss's argument in an early blog post. So obviously, this book is now out. Now, of course, as expected, it doesn't garner as much brouhaha as Hawking's book, even if the argument is as damning (and in my opinion, stronger) than Hawking's. Did those people who made all those noises against "The Grand Design" got tired and ran out of rants?
Empty space, as it turns out, can't be perfectly empty. Every type of matter has an equal and opposite counterpart, and pairs of particles and their anti-particles can spontaneously emerge from empty space and then disappear again.
One consequence of quantum mechanics' uncertainty principle is that a vacuum cannot remain perfectly empty forever. Not only will particles pop in and out of existence without violating the laws of physics, they have to.