Never!  And if so, I hate to think what I am most of the time!  And I can see now what you meant about historical v. future calculations.  I'll look forward to both the diaries and try to refrain from commenting -- goodness knows what stupid thoughts will pop into my head!  I'm the opposite of mathematically minded, so most of my thoughts on the subject are inappropriate or irrelevant. I do, however, enjoy reading about it from those who know better.  :-)

Maybe we can eventually make language a complete impediment to understanding. -Hobbes