Psyringe: 1. According to Immanuel Kant's "Critique of pure reason", "nothing" can exist in at least four different forms. Which of those do you want us to vote for?
While Kant is a great philosopher, that's one point where I disagree with him. Strictly speaking 'Nothing' can not exist. Because the fact that something exists already contains the fact that it is something. So Nothing can only not-exist.
Or from a different, less semantic viewpoint: physically 'Nothing' can not exist because it would have an absolute value for momentum and position - zero - which is forbidden by the laws of quantum dynamics. (That's why we get vacuum fluctuations - and yes, it can be experimentally proven that they exist).
And even from a conceptual point of view, nothing cannot be. Because just by naming it, you make it a concept. And as such it isn't nothing anymore, but something you named nothing. So the notion of 'nothing' is a contradiction in itself.