At the moment I am having memory problems that prevent me from remembering prepared statements, but in the past I've done alright. I used to teach an occasional class to engineers, and my supervisor said I was pretty good at it.
The scariest public speaking I've done was in a class in college, where we were graded on short speeches every week. It seemed the professor didn't like me and I could do no right, and I was getting B- on all my speeches, so one day I decided to just give one without any preparation and see how that compared to my best efforts. I just winged it. Got a C+.
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