I remember a high school teacher telling me that with the rotational nature of atoms that it would physically, though improbable, be possible to drop a pencil through a table.
So Im trying to figure out if a particle that can pass through matter would be an unknow element (Very unlikely.) or a particle formation that heretofore has never been observed.
Im surprised a concept like this has gone unexplored for as long as there have been physical scientists and theoretical physics.
Neutrinos are very, very, very small comparatively speaking, to atoms and even electrons...........
YoYodyne Industries had an overthruster on the market a few years back based on that principle.