When I was a boy I was sure I knew everything! <img src="smile.gif" border="0">
As I got a bit older I became less sure. <img src="frown.gif" border="0">
Approaching middle age I was sure I was less sure <img src="redface.gif" border="0">
Well past middle age I knew I was less sure <img src="eek.gif" border="0">
With dotage in sight, however, I am sure that it is not even remotely possible to overestimate the dumbosity of the "General Public" at large. <img src="eek.gif" border="0">
Just because they are smiling and nodding their heads doesn't mean they are even close to understanding what it is you are saying.
I find an enigmatic smile with a petit Gallic shrug in response to a question works way better. <img src="cool.gif" border="0">