stealth_nsk
Deity
After looking at the technology tree I see one thing returning from Civ3 and earlier. Now each tech requires all its prerequisites to be researched. On the tree researched techs are in yellow, techs, which could be researched - in green and techs, which can't be researched - in black. So, as you can see on the shots, Printing Press, which requires Physics and Machinery, can't be researched even if Physics is complete.
Also, all connections seems to be displayed on tree (in Civ4 absolute requirements were displayed on tech description, not tree - i.e. Pottery for Metal Casting). This should simplify the tree navigation a lot.
Also, all connections seems to be displayed on tree (in Civ4 absolute requirements were displayed on tech description, not tree - i.e. Pottery for Metal Casting). This should simplify the tree navigation a lot.