Here's some featured I'd like changed or added to make the science-related UI more useful and informative.

• Add a distinct icon to the actual "tech-card" representation (so it's visible in all tech views) for repeatable end-game sciences. They don't stick out nearly enough as it is.
• Add the ability to zoom in and out of the tech navigator window, being able to see the whole tree would be useful.
• Add something (default visuals or toggle) to make it abundantly clear that a tech has already been researched in the tech tree (tech navigator window).