Mr Donald Rumsfeld said this.
'As we know, there are known knowns. There are things we know we know.
'We also know there are known unknowns. That is to say we know there are some things we do not know.
'But there are also unknown unknowns, the ones we don't know we don't know.'
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1 comment:
do what u can wisely with the known and nothing much u can do with the unknown
Jiayou!
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