The AI is extremely reluctant to trade stuff. Apparently, it won't trade at all unless it get things at outrageously good prices. Now, I would like to know whether the AI's is equally reluctant to trade in-between or if it's only with the player. In either case, I think the AI needs to be changed. Trading techs and more is extremely helpful (if you trade with three players you only need to research one fourth of the techs you would otherwise have to).
Apheirox
...Is there a reason for doing that or is the AI bugged? Also, I saw a planet where two economic capitals had been built. Isn't that impossible? Can't you only have one of each type of capital?
Mass Drivers Cost: 200 bc Required Tech: Planetary Bombardment Affect: +100 - +200 attack value Affect: -10 - -50 PQ Affect: -50 - -100 planetary buildings Notes: This attack is great if the enemy out numbers you by a large amount. Also if you don't care about the PQ or building left after the attack you may use this to ensure you will win a close fight. One useful tactic is to use this attack with a minimum of you
My guess is social production is buildings and military production is ships but I honestly don't know.