Apparently you may be able to zap neutrons into another universe... This is relevant to Avatars because, as our characters have discovered, the story hinges on virtual realities being somehow windows into other universes... Thus the appearance of creatures from those other universes, or the disappearance of people from this universe into those worlds. The above is less promising than the headline sounds, unfortunately, since you basically have a very, very low chance for any individual neutron to get propelled into another universe, and even if you got one over the wire, well, it's a neutron, what can you do with it? But still... What if you really did have the chance to step into an alternate universe? Wouldn't you be curious enough to peek?