It's not free. Babylon's spamming Academies everywhere and as a result has fewer farms and mines - it doesn't produce enough food to support many specialists or rapidly grow while farming those 2 food, 8 beaker tiles, and it doesn't have the production to produce more than the essential specialist buildings for its science rush. Its big boosts from its academies only work so long as it has enough citizens to work those academies as well as to act as the specialists who churn them out, and on top of that you need to be able to work at least some farms and mines while keeping your academies staffed. And if, as in your above example, Babylon has gone Liberty - a policy tree that's not a good fit for it for anything other than the free GS (EDIT: And the building production boost) - it doesn't have Tradition growth bonuses to help. All of which is why it has been repeatedly pointed out that Babylon is not a flexible civ. Korea doesn't need to produce its boost from 3 citizens because it has the ability to support many more than Babylon can. And it too can go Liberty if it wants to, giving it a 10-pt academy of its own. As an earlier poster mentioned, you're neglecting the free science from science buildings boost. Korea saves 5-8 turns from a library, I presume the same again from National College (and I'm still not clear on whether the Oracle counts as a "science Wonder"). Babylon might reach Education 5 turns earlier, but probably not much more than that unless the Korean NC is late.