I think it's a bit confusing too, but the idea is to show that you can't research both techs. There's also another problem with e.g. the technologies that improve stone or metal gathering. If you research the stone improvement first and then in the next phase the metal improvement, it's not quite clear if the previous upgrade is still activated or if it gets replaced or if you didn't get the highest possible upgrade for metal because you selected stone first. At the moment I think we can only express these relations in a techtree and not in the small space for unit-training and research when you select a building. Maybe we should remove the icons there and only allow research in a techtree gui?
I think we should leave the Hindu/Indian names out till the new faction is actually in IMO. Looking at the Alpha 11 Roadmap makes me think that proper Mac support (and perhaps gates) are the the order of the day. Is there any ancient "K" word for apple?
This. Especially when it comes to phalanxes of units, the Romans didn't expect to win the melee head-on on even ground, thus they started throwing spears before the charge to throw the phalanx into disarray. Also, they employed flanking heavily.