Why the green great dragon can't exist
MATTANDERSONBBC
The former US Defence Secretary, Donald Rumsfeld, famously warned that in any situation there can be known knowns and unknown unknowns, the latter being the most potentially dangerous as they are "things that we don't know we don't know".
But missing from his list were the unknown knowns, the things we know, but don't realise that we do.
The power of such knowledge - things we perhaps can't recall ever learning, but use all the time without thinking - has been illustrated by, of all things, the popularity of a tweet about the correct order in which to use adjectives.
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