Does this mean we will someday need "Paratime Police?"
Way off topic, but H. Beam Piper's "Paratime" stories plus "Lord Kalvan of Otherwhen" has been re-released in one volume. Classic tales of linked, parallel universes and the possibilities of travel between them. Now the physicists and cosmologists are again catching up to the bards and storytellers.
Best,
Frank
"How many universes can float on the head of a beer?"