I think when you write on the board while teaching, you are using your whole arm and not just your fingers. Therefore, you have more success. My handwriting varies in its clarity. Oddly enough, when my Sinemet kicks in, my handwriting gets worse. My hand jerks unexpectedly causing all kinds of unexpected results.

Back to speaking: I have developed a head bob when I speak to someone, and it makes me look quite earnest. Either earnest or very agreeable!

Ann