It would be helpful to be able to get more information on technologies from the tech tree. Right now, if a given technology allows me to build a given building, I can mouse over the building's icon, and its name will appear, but nothing else. It would be helpful if I could hold my mouse there, and have more information come up (eg. the building's effects on my city), or else if I could click on the icon and have a screen describing its function come up. Similarly, for technologies that have effects other than allowing new equipment, buildings, etc., it would be helpful for a more detailed description of what they do to come up. Does the technology increase all units' movement speed by 1, or decrease buildings costs by 10%, or what? As it is, when choosing a technological advance, one can only guess, often not very well, what the effect will be and whether or not one technology is worth taking over another, especially in response to any given need in one's kingdom at the time.