I'd like the ability on the technology screen to select 'health' and have every technology that affects health whether through a building or wonder to light up. Or select 'wonders' and have every technology that unlocks a wonder light up. Or 'air unit' to find all the air units. Etc. For somebody who only won his first game yesterday (emancipation victory), I had a devil of a time learning how to find more paths to pull my health out of the negative or find a new military unit. I was basically lost when it came to the tech tree.