As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don’t know
We don’t know.
The missile knows where it is at all times. It knows this because it knows where it isn’t. By subtracting where it is from where it isn’t, or where it isn’t from where…
As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don’t know
We don’t know.
You get the idea