Board Thread:Manga/@comment-25933225-20190729085225/@comment-37559647-20190729171724

First my apology about my bad English, English is not my mother language.

About the questions:

A. Attack on Titan is a Manga so we can't compare this world to our world, things of invented in our world at the 19 century can exist in the world of Attack on Titan from the beginning of time.

P.S the first documentation for the syringe (not subcutaneous) is for the 9 century (maybe even earlier).

B. There is no need to inject the serum/CSF drank it is enough.

C. about the Original Titan power, I guess he can change humans into Titans without the serum.

D. About "Ymir Fritz" herself (if that was her real name) I read a hypothesis that she was eaten by humans and not by Titan.