Do now #107 (Incomplete knowledge)

I believe that there are a lot of knowledges that are incomplete in this world. One of the them is that we might have some supernatural animals in this world. There are some kind of myths about unicorns or dragons. Some of people gave up on finding them out, and just believe that there are no such things. However, they might exist somewhere we don't really know. This makes our knowledge incomplete. We just think that if we can't see by our eyes, there is no such thing which makes us quite ignorant. We can just determine that there are not such animals in this world. Therefore this issue about supernatural animals are incomplete knowledge of humans.