What? Are you saying that if an AI civ has a tech that I don't have, that after discovering the AI civ, that/those techs won't cost me as much? Or the tech I'm currently working on... What? Edit: Ok I just started a new game on Immortal. I kept track of the tech chart and when I meet China, who must have 4 techs more than me, nothing changed in my tech tree. 2nd edit: I've noticed after discovering around 4 ai civs that there is a reduction by 1 on some of the techs.