"Imagining the Tenth Dimension" is an interesting read from a philosophy standpoint, but it doesn't have very much to do with the actual dimensions of space and time. Atoms aren't subatomic, and anyway subatomic particles don't travel in time other than in the same way we do (Unless you want to view antiparticles as time-reversed regular particles, but in which case our interaction with them only takes place on a time-forward basis).