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Most Americans probably heard of this via Donald Rumsfeld, 'known unknowns' etc https://www.youtube.com/watch?v=GiPe1OiKQuk https://www.youtube.com/watch?v=GiP

by arh68 12y ago

Most Americans probably heard of this via Donald Rumsfeld, 'known unknowns' etc https://www.youtube.com/watch?v=GiPe1OiKQuk https://www.youtube.com/watch?v=GiPe1OiKQuk

aledalgrande 12y ago
Ah yeah, I found that during my research for the post.