matthewv
Emperor
"OR" links are by definition depicted through the arrows. It's the "requires" notes that depict "AND" stuff in Civ4, remember?
Well, the first 2 techtiers are mostly from Civ4, so you can complain at them. Check your F6-screen in a game, Firaxis used the prereqs I used. This said, I agree with you and was thinking of using Superconductors as a requirement for Fusion.
On Genetics, again it is straight from the Civ4 techtree. I thought it was valid since genes (in laboratories) need to be stored at low temperatures and superconductors are a good tool for that? And yes, Low-G Biology can be an "AND" requirement for Genetics too.
Ahh, Now I see what you did. I guess we can start changing things when we start playtesting.