Tell me where the uncertainties are in the Lord's Prayer, Joe, almost the chief mantra of Christianity.

Good post, DMcG. I well remember that the bods at school who did best in maths exams were the ones who did their differential calculus mechanistically, who got good at jumping through hoops but with little understanding of the processes they were working through. I found the whole thing an obstacle course of incomprehensible concepts and steps, which is probably why I ended up being a biologist. :-)