First piece of literature for a while; I had been all out of inspiration. This is, essentially, about both superluminal travel and pensive hindsight. Alter the ratio of each as necessary.
This is a probable candidate for future revision.
Serguei Krasnikov is a proponent of his self-named space-travel tunnels for faster-than-light motion. However, in the case of more than one such tunnel these short-cuts would become time machines and causality & vacuum fluctuation would remove them from existence entirely.
Theoretical cosmology can be more exciting than one would first assume.