I was wondering why some research paths simply aren't available, for some reason, at some times, in some games I started up a civ today, and I wished to pick up The Wheel near to the beginning (success), then either go for mapmaking or get started towards monarchy. I got mapmaking next, with great satisfaction, too, because I'm figuring out I'm on a pretty small island. There was only 1 rival and I gg'd him with a chariot. So here's where I stand: Alphabet (started with it) The Wheel - first research Mapmaking - second research Code of Laws - third research The pic is my list of new possible paths: masonry, bronze working, pottery. There is no Ceremonial Burial, which was my next target in the line for Monarchy. I reckoned a tech like that, with NO prereqs, would always show up in the list. So... why do I need to spend the next few hundred years on a tech I don't need yet? What governs the filtering of techs from this depressingly short list, so I can avoid these setbacks in the future?