June 30, 2021

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.

-Donald Rumsfeld, Department of Defense briefing, Feb. 12, 2002