There are a lot of things we don't know. We learn things every day, but there are still so many things out there that we've yet to discover. For example, did you know that:
-There are trillions of galaxies in the universe
-The ocean is so deep that if you were to walk in it forever, you would never reach the bottom
-Albert Einstein was afraid of cats
Insects can survive being eaten by another insect
-There are more stars in space than there are grains of sand on all the beaches on Earth
-You will die one day (hope I didn't scare someone)
I will like to go through your content later.