True. But possibly put it best by that great thinker Donald Rumsfeld: https://www.wikiwand.com/en/There_are_known_knowns https://www.wikiwand.com/en/There_are_k

True. But possibly put it best by that great thinker Donald Rumsfeld: https://www.wikiwand.com/en/There_are_known_knowns https://www.wikiwand.com/en/There_are_known_knowns