[Armin doesn't know what a PHD is, but it sounds like something impressive.]

Please! I want to know, but sometimes its hard to know where to start. Compared to my own world... everything here seems to have progressed so much further.

[When he came here, they gave Armin a tiny device with which he could talk to people a whole city away, while viewing them on the screen and everything. Back home, they have a telegram and even that wasn't in every post office.]

Eren gave me an atlas for Christmas, but some of the references are a little hard to understand.

[Well, they are to a guy with a pre-industrial frame of reference. Especially when science and exploration had not been highly prized in his world.]