I'm working on a short story set in the Edge universe.  It features Cross, and it's set in 1935.   I wrote a scene where a man approaches Cross for help, and Cross asks if there is a bar in this berg in Oklahoma.  Well, I knew prohibition had been repealed in December 1933, but I figured I better dig a bit deeper.  Turned out the states could remain dry.  Next thought, Oh hell, this story is set is Oklahoma.

So, I check out Oklahoma.  They didn't repeal prohibition until 1959.  So the scene I had envisioned just blew out the top of the computer.  Now they are drinking from Cross's hip flask on a bridge over a crick.

Instead of leaping forward with my story as planned I spent a lot of time reading about prohibition.  It was all interesting, but not a lot of forward progress.

It's a shame when facts get in the way of your notions.  Wish I were a Republican -- then I could just ignore inconvenient facts.