And this is Rumsfeld's only positive contribution to society: A pithy little "(un)known/(un)known" quip It's hardly original to him. It's a negative contributi

And this is Rumsfeld's only positive contribution to society: A pithy little "(un)known/(un)known" quip It's hardly original to him. It's a negative contribution, as a lot of dimwitted people disavowed the idea of unknown unknowns after he said that. It's actually a valuable concept.