1974, 1st known TV reference to 9/11 in context of changing history
Dr. Who premiered 11/23/63, day after JFK killed
fuggen boomer aliens are the worst
that almond-y taste is in the seeds of good small apples too
it's not, of course.
proving a negative is spectacularly hard to do.
proving just about anything is hard to do. consider 9/11, how they can change science and engineering to fit their answer