(NAB) After getting Philosophy...

The advisor wanted Map Making, but i changed it to Literature, then suddenly in the same turn, i go out to the main screen, and see that i was still researching map making, so i was annoyed, entered the science screen again to choose literature, and to my surprise Literature was already acquired. Instantly?!

Not a bug.

You get a free advance with Philosophy if you are the first to learn Philosophy.

Oh, didn't know... thanks, I'm Greece by the way