Hello all. I bought this fantastic game under a week ago and I'm still just trying to take it all in. I'm sure my questions have been answered elsewhere already, but I've read several different strategy articles and many other random posts while searching and I didn't find the answers, so here goes.
1) I know that trade routes for a city are limited in number and automatically decided, but I'm curious if it's based on whichever are the most profitable, and more importantly, if they can change if newer more profitable routes are possible. More specifically, say a city has its only two trade routes with my own nearest cities, but I make contact with a large distant foreign port city that would yield greater returns, will this automatically replace one of my domestic trade routes ?
2) Aside from wonders, buildings, or techs that give a boost to a specific type of GP percentage points (like the TGP, Stonehenge, etc.), does increasing the number of specialists of a specific type in a city also increase the corresponding percentage of that specialist? I ask because I had a city that built Stonehenge, so it had 100% great prophet, but later I built a library and went into the city screen and added 1 scientist specialist but I didn't see the great scientist percentage change right away. At first I thought that maybe it had no bearing on how the percentages were decided, but later I realized that maybe I just needed to let it run for a turn first? Later on I checked back and that city had a substantial GP percentage devoted to scientist, but I hadn't built any wonders that increased great scientist points, although the city did have a scientist specialist added for quite some time that I didn't realize.
3) Do barbarians vanish from the world after a certain era or amount of time? That would make sense, though I haven't specifically read that anywhere or played long enough to see for myself.
4) I recently built the Great Wall for the first time, in my capital. When I did, I had 4 cities. My capital and its nearest neighbor were connected by a culture boundary, but the other two were very new and only had their surrounding 8 tile boundary, disconnected from anyone else. Graphically the game placed the wall around the culture boundary of the city that built it which included its nearest neighbor. As the other two cities' culture boundaries expanded to connect to my capitals', nothing changed graphically on the map. My question is, will barbarians be prevented from entering all of my cities' individual culture boundaries, or only the initial graphical representation of my capital and its nearest neighbor, or only the cities whose culture boundary is connected to the city that built TGW?
Thanks for any replies.