OK.
So there's the known unknown.
And the unknown unknown.
And there's the place (as per Nick Tosches) Where Dead Voices Gather...
And 99.00% of the species that have walked the planet are extinct.
And we are the supremely confident Lucky Duckies still kicking around who think we have it knocked.
And we are all quite skilled at blinding ourselves and each other.
Situation Precarious!