As the speed of matter approaches c, relative time slows to a stop. At c, matter theoretically consists of infinite density and zero mass (IIRC). And time freezes, relatively. It is theoretically impossible for matter to have those properties. Yet there are tachyons, which appear to move faster than light.
Particles in a quantum wave function only potentially exist, and their location or vector (according to Heisenberg) cannot be determined until the particle is observed. And once observation ceases, they resume potentiality.
You can predict that an electron will be orbiting the nucleus at a given distance, but it could be anywhere on that spherical target area. So it exists anywhere on that sphere--and nowhere, if you're not observing it.
That's about the upper limit of my understanding. Wave function collapse is the one I haven't studied.
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