There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are… — Donald Rumsfeld Copy Share Image
As known unknowns become known; unknown unknowns proliferate; the larger the island of knowledge, the longer the shoreline of wonder. — Huston Smith Copy Share Image
There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say… — Anonymous Copy Share Image
There are known knowns and known unknowns, but what we should be worried about most is the unknown unknowns. — Gary Marcus Copy Share Image
“Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are… — Donald Rumsfeld Copy Share Image
