It wasn't until I was taking a college-level optics course before I learned that I wasn't seeing things. I had noticed the optical properties of thin films as a child, and retained it, but never felt the need to actually tell anyone about it.
That wasn't a particularly world-changing thing for me to notice, but it makes me wonder what (if anything) I might have learned in my life that *is* special. How would I know?
It's in the same vein as thinking about known unknowns and unknown unknowns — you can be aware of your own ignorance, but your own ignorance might be so deep that you literally cannot be aware of it.
Likewise, there may be unknown knowns — things you know but have no awareness of knowing.
I have noticed. This is why I say that Mother Nature will solve the problem by killing every Homo sapien.
It is just a matter of time.