"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 know we don't know. But there are also unknown unknowns. There are things we don't know we don't know."
Former US secretary of defence Donald Rumsfeld's distinction between known unknowns and unknown unknowns has passed into everyday speech. It's not the things of which we know we're ignorant that we should worry about, he pointed out. It's the things we're unaware of not knowing that can really cause trouble. It's a useful reminder of the vastness of human ignorance.
But might there not be another kind of unknown, which Rumsfeld didn't mention - one that consists of things we choose not to know?
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