Board Thread:Theories and Speculation/@comment-28819877-20170801141801

I find unbelievable the fact that nobody (except few people) knew about Kaguya and her considerable actions throughout the history. Considering that she and her clan lived among other people, there were a lot of them who could register information about her for future generations.

Also, Gokage didn't know about Ten-Tails either, indicating they lacked of knowledge about it too.

So how is it possible for Ninja World to be not informed about events in the past? Does it mean that history as a science in this world is hardly developed? 