Looking for some help...I've finished several Tech victories, but I seem to be missing something. I research all the clear pre-reqs for the final 3 techs (1 in each of the 3 trees) but those 3 techs don't seem to show up for some time after. Is there additional pre-reqs required to research each of those or do you have to have a certain % of the tech tree researched before they show up?
I've noticed similar when bee-lining a tech, for example Atmospheric Cleansing this last game. I had the obvious pre-reqs done but the tech wasn't showing up. Showed up later after I had researched several other techs in that tree that were not in that line.
Any insight into how the tech tree works would be great...can't seem to figure out exactly what's going on.