I've read several posts in which people complain about the game getting boring quickly when one of the Civs becomes too strong (and stronger ever after) and the final result in not really in doubt anymore. How can we keep those games interesting ? How can we give the weak nations another fighting chance without handicapping the superior nation too much ? A good solution IMO would be something like "Common Knowledge". I'll explain right away. The backbone of the game is obviously the Tech tree. If you're too far behind in Tech and you have little money and resources, you basically don't have a chance anymore. However, if EACH civ could benefit from a kind of "Great Library" effect in A CERTAIN SITUATION, the trailing civs might still be able to catch up. Suppose that EACH TECH which is known by AT LEAST 50% of all civs AUTOMATICALLY becomes a known tech to all other civs as well , FOR FREE (just like the Great Library does) don't you think that would throw a new lease of life to some civ's who are way back on the power chart. For instance, you're dead last and trailing by at least 10 techs, but then some of the more powerfull Civs start trading tech amongst each other, breaking the 50% common knowledge threshold and all of a sudden you get that Tech as well, for free, because it's no longer a mystery to the world, it has become "common knowledge". Civs would have to think a little now before they start trading their newly discovered techs away too soon and to too many other civs. Example : In an 8 civ game : trade away your new tech to 3 opponents and the other 4 know the tech as well, for free, as the tech becomes "common knowledge". Selling Techs amongst each other (AI) would not be as rampant anymore and would no doubt bring on a more "selective" game, adding more depth to the game. (who do you sell to? The highest bidder or maybe the neighbour of your biggest rival - for a bit less ? How many civs already know of that specific Tech ? Hey, one more and I get that tech for free, time to start up my research again in another branch, I might get a new chance here ............... etc. In short : Giving the backward civilisations techs for free when they are already known by at least half the world sounds logic to me. Those techs should have no mystery about them anymore. Great way IMO to keep the game close (enough) and interesting until the later ages.