There are things we know
don't be wrong in traffic
don't **** angry hippos
don't traverse rickety stairs
these are things we know 
we are aware, and refrain

There are things we don't know 
yet are aware that we don't know
neutonian physics
slavic languages
origin of universe
these are things we don't know
but are questing for answers

There are also things we don't know,
things we don't even know we don't know
I attempt to reduce this category daily. 
and plus
this category only hypothetically
exists, and isn't that true about
Anything?