Our biological organs sense the world around us and interpret it. We "hear" sound waves interpreted in our brain and so on. Thus, is it possible that there are other forms of life living among us that we cannot sense? If there are waves, beams and whatever's in the environment that our biology isn't capable of picking up on then is it possible we coexist without knowing it? I guess the simple answer is no because we would physically "hit it" while walking or something but what if that is what we see when humans see "ghosts"?

In other words, what if aliens exist and our world has for more "life" than we will ever know but are simply, organically, incapable of knowing it?

yes

I know you love the news of the weird, don't hide behind a stock answer, expand please. Bonus, I am drunk so I actually want to read what you think.

This proudmanlet, give it to us all.

yes it is possible there are things in this universe beyond our human comprehension because we are limited by our biological function; unless someone invents something to help it