I. INTRODUCTION REPORTS THAT SAY THAT SOMETHING HASN'T HAPPENED ARE ALWAYS INTERESTING TO ME, BECAUSE 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. (1)
