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Secondary Academies
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See also Evony Theory Crafting

Be sure to upgrade your academy in your second city to at least level 2 to gain the production bonuses. 

Level 3 gives you Iron Working (5% defense per level) if you launch attacks from your second city. Archery requires Academy level 4, necessary to build Archer's towers to defend your city. 

Hover over the button in the Academy to see the minimum requirements for each science!

Each research will say its level and its level in the city you are in.
The "Ct.0" means that since your academy is not a high enough level, you will not have the benefits of "Military Science" in that city.