Known knowns – there are things we know, we know.
Known unknowns – that is to say we know there are some things we do not know.
Unknown knowns – we don’t know that we know this.
Unknown unknowns – the ones we don’t know we don’t know.
Known knowns – there are things we know, we know.
Known unknowns – that is to say we know there are some things we do not know.
Unknown knowns – we don’t know that we know this.
Unknown unknowns – the ones we don’t know we don’t know.
