That's very nice, Panopticon! Here's some thoughts:
- I tried to classify the techs with the 5-era system I proposed on this thread (if you guys still think it's relevant). It wasn't hard. However, some eras (Discovery and Machine Ages) have significantly less techs than the others. It's actually not a big deal, but we could try to balance that a little.
- There should be, in my opinion, a tech for caravels, because they have little to do with optics (lateen sails? Also, are galleys or a similarly primitive ship going to be in the game before you get galleons?).
- I'd like to see film and/or television, for their huge contribution to media, art, and diffusion of ideas. Film could require Optics and Electricity, while TV would need Film and Radio.
- Personnally I'd get rid of Mass Media, I think it's too vague and doesn't lead anywhere. Especially if Film/TV are in.
- Other suggestions include Propaganda, and Trade Unions. I also thought about Journalism.
- You have a lot of Physics techs here... I'm not complaining, I love physics!

But Dynamics should definitely be discarded and merged with Newtonian physics.
- Revivalism? A quick Internet research leads only to Christian revival... not very pertinent with China, Japan, Turkey, etc., is it?
- I'd rename Internet to Computer Networks (it's more general), especially if we keep Internet as a project.
- Perhaps a few more futuristic techs should be added (what's the end of the calendar again?), and Future Techs, I'm sure, are not going to be just improvement on stealth.
