Known and Unknowns...

As I was walking the corridors in my office and looking at the notice boards, this caught my attention. Ofcourse this was aided with some analogies in the office.

But take a guess who came up with the poem or write-up below, w/o googling???
Take an intelligent guess...

The Unknown

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.

—Feb. 12, 2002, Department of Defense news briefing