Ah, this video is totally bogus. Here's the problem: when you say that the electrons surrounding two atoms push each other away (via the electromagnetic force), and that therefore two surfaces can never actually touch one another because their electrons keep them apart, I must ask: then what is the actual surface of an object? Electrons themselves don't really have a surface (at least in the way we would think of it), and an "electron shell" is a very fuzzy concept as well. Neither of these serve well when trying to define the surface of an object. In actual fact, the only truly useful definition for the "surface" of a physical atomic structure, in terms of how it interacts with other physical structures, is the electromagnetic boundary surrounding that structure. In short, don't believe this guy. When two surfaces touch one another, they really do touch. There's no other good way to describe the phenomenon.