One choice! IF THERE'S ONE thing in your life that you could change what would it be?
Going back to 1996 and working about 5% harder in grad school would have eventually netted me a doctorate in History and the teaching career I always planned on... instead that path dead-ended at a Master's, followed by drifting from career to career, and eventually 19 years in civil service. Not a dishonorable or worthless course by any means, but not what I had wanted or intended.