March 20th, 2011

zap

known knowns, known unknowns, unknown unknowns and unknown knowns

There are known knowns; these 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.

... there is a fourth, the unknown knowns, that which we don't know or intentionally refuse to acknowledge that we know...
  • http://en.wikipedia.org/wiki/There_are_known_knowns
  • http://en.wikipedia.org/wiki/Unknown_knowns