This is totally based on zero evidence, but it seems to me, as a casual observer, that maybe there are elementary particles whizzing aren't detectable until the

This is totally based on zero evidence, but it seems to me, as a casual observer, that maybe there are elementary particles whizzing aren't detectable until they combine with other elementary whizzing particles and combine to make the detectable ones? So like hydrogen can be fused into helium (I know, easier said than done!), sometimes the they collide and create a detectable particle. This explains the Casimir effect in that there really wasn't nothing between the plates, just the stuff whizzing through the plates that we can't block.