People writing "Paratime", time-travel and multiverse stories, kindly keep these basic points of logic in mind:
1) You do not exist in a world that diverges from your own world prior to your conception.
2) It is increasingly unlikely that someone with your name will have been born as the divergence-point approaches the conception of your respective parents.
3) Divergence doesn't change the laws of physics, unless the divergence *is* the difference in the laws of physics/magic/whatever the hell your superhero justificatory hand-waving calls itself.
4) As always, you're allowed one point of divergence. No cheating and invoking multiple divergences, excepting only the appearance of your characters in the parallel world.
5) Point 4 goes out the window if you've included Paratime Police or Paratime Imperialists in your world-setting, but try to keep it consistent, people!
I'd beg for politically/economically/militarily realistic world-shifts (no, making the US revert to isolationism after WWII does *not* get you your shiny-green peaceful utopia, you commie-symp jackass! It gets you Not This August in spades!) but I have to recognize that commie-symp writers gotta commie-symp. But thanks for waving your sign wildly enough I know when to nope out of the story, you schmuck!