Unknown Unknowns Quotes
- There are known knowns and known unknowns, but what we should be worried about most is the unknown unknowns. — Gary Marcus
- There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we… — Donald Rumsfeld
- There's always the risk that there are unknown unknowns. — Nate Silver