I'm a history buff, so I find myself in that situation
   frequently. I've done a lot of unlearning what I was taught. I
   don't know as much about China as I'd like, but I was taught a
   lot of ahistorical things about the period of time between
   around 500ad - 1400ad that I had relearned properly in my 20s.
   Byzantium stuff. Anyway, let me get to the other question.