We've had a few discussions, one fairly recently
, about different methods to travel between or otherwise exploit parallel universes. I'm interested in Black Hole Spores here
, though it has several wacky ideas.
edit: I might make this more specifically about tangent exploitation, without full, or at least fully controlled, tangent travel. More to add. This post has been edited by uncle_jimbo on Oct 14 2018, 00:48