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Modernization

Thechnologies spread along trade routes. The effect of this mod is that players don't fall too far behind in tech, as more they lag higher the chance to acquire a tech from trade.

Backwards civs also get free buildings through investment and philanthropy when advanced civs research new techs and adopt policies. Benefactor civs are rewarded with small amounts of gold and culture.

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*** Tech Diffusion ***
For each trade route, the chance of acquiring a tech this turn = SPC * Bkrs / Era,
where SPC is your civ's science per capita, Bkrs is the science yield for the route (beakers), Era - current era (ancient=1, classical=2, ...).

*** Investment ***
When a player researches an Industrial era technology, a Bank is created in one of the cities belonging to the civs which havent get to the Industrial era yet. A city with max gold output is chosen for this. For Modern era techs Factories are built in most productive cities of the 'third world' and for Atomic era techs Hotels are built in cities having highest tourism output. The 'investor' civ gets 150 gold (on normal speed) as revenue.

*** Philanthropy ***
When a player which is currently in the Modern or later era adopts a policy, a Hospital is created in the largest city of the 'third world'. When a player adopts an ideology tenet, a Public School is created instead. The 'philanthropist' civ gets 75 culture for that (on normal speed).

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Balance

To balance the free techs from trade, Library and Public Shool give 1 science per 4 population instead of per 2.
On the other hand per-city science penalty was removed so founding new cities doesnt increase tech cost. It slows down tech diffusion though as your science per capita diminishes. In result, bigger empires rely more on themselves in research, while small countries get more techs from trade.