> Speaking in 2002 about weapons of mass destruction, United States Secretary of Defense Donald Rumsfeld infamously distinguished between the “known unknowns” a

> Speaking in 2002 about weapons of mass destruction, United States Secretary of Defense Donald Rumsfeld infamously distinguished between the “known unknowns” and the “unknown unknowns” Rumsfeld rather famously distinguished, as the world has proved by endlessly quoting and paraphrasing him. The infamous appellation here is presumably based solely on the authors' dislike of Rumsfeld. I stopped reading.