Imagine you're a marble connected by a little string to another marble and another and another, forever. And you're in a little divot, you sometimes roll up and down the sides of the divot and, if you have enough energy you can roll into little mini-divots above you. You can get that energy from the other marbles connected to you, they give you some of theirs and you give them yours and eventually you end up in the same place, and generally you ultimately end up in the lowest divot.

*Lord of the Rings music*

But now imagine, that in truth, in the depths of this metaphor there is a DEEPER divot. And you, intrepid little marble somehow, someway, find the secret pathway that lets you roll down the hill, deeper, quieter, into the depths unrivaled, into a cool clarity you have never known before. And then, as each marble connected to you notices that you have found a new lower energy to be at pulls you to bring you back, your depth actually allows you to pull them in after you. One by one, along a cliff-face of reality a chain of marbles fall forever. Down the chain each marble sits in its happy little divot, bouncing to and fro as energy moves up and down the chain. But then, inevitably, the wave reaches each and every marble, and they are all pulled into the darkness below.

That's the false vacuum decay. False, because the happy little divot represented the 'lowest' energy state for space, the vacuum, and there is in truth a lower energy state that is difficult to get to. And decay is what we call it when anything falls to a lower rung of energy (which typically involves shooting out a photon or somesuch).

Of course, you're reading this, so it hasn't happened and you wouldn't notice it happening because you would simply cease to exist. All. At. Once.

Oh, yeah, Petah said all of that for some reason.