"Protection from influenza vaccine is thought to persist for a year because of waning antibody and because of changes in the circulating influenza virus from year to year."
Thought to? WTF does that mean?
It would be called time travel. For both particles to experience the same state at the same time, it would have to be sent the information into the past in order for it to be synced in the present. It would be that fulfill FTL communication?