Hi Murray, did you ever read Arthur C. Clarke's Imperial Earth? set I belive in 2276 -- the protagonist, Duncan Makenzie, listens to a tape of Armstrong and muses "as always, he listened for the missing "a" before man and did not hear it. A whole book had been written about that slip, starting with Armstrong's slightly exasperated 'that's what I meant to say, and that's what I thought I said.'" don't have that book with me, but that's what I remember.